#include <stdio.h>
#include <string.h>
#include <stdbool.h>

/*DEBUG*/
enum
{
    MAX_LEN_PATH = FILENAME_MAX + 2,
    MAX_OPEN_FILES = 100,
    MAX_NUM_FROM_FILES = 4
};

int mas[MAX_OPEN_FILES][10000], sz[MAX_OPEN_FILES];

void
my_func(char path[MAX_OPEN_FILES][MAX_LEN_PATH], int num)
{
    FILE *out = stdout;
    FILE *in = NULL;
    printf("FUNC\n");
    int i, j, pos[MAX_OPEN_FILES], sz[MAX_OPEN_FILES];
    for(i = 0; i < num; ++i) {
        in = fopen(path[i], "r");
        sz[i] = 0;
        while(fscanf(in, "%d", &mas[i][sz[i]]) == 1) {
            ++sz[i];
        }
        fclose(in);
    }

    for(i = 0; i < num; ++i) {
        pos[i] = 0;
    }
    bool flag;
    for(i = 0; i < sz[0]; ++i) {
        flag = true;
        for(j = 1; j < num; ++j) {
            while(pos[j] < sz[j] && mas[j][pos[j]] > mas[0][i]) {
                ++pos[j];
            }
            if(pos[j] == sz[j] || mas[j][pos[j]] != mas[0][i]) {
                flag = false;
                break;
            }
        }
        if(flag) {
            fprintf(out, "%d ", mas[0][i]);
        }
    }
    fprintf(out, "\n");
}

#include <stdlib.h>
#include <time.h>
void
my_gen(int num, int N)
{
    FILE *in = fopen("input.txt", "w");
    FILE *ff = NULL;
    char path[100], number[100];
    int i, j, c;
    srand(time(NULL));
    for(i=0; i<num; ++i)
    {
        path[0] = 'i';
        path[1] = 'n';
        path[2] = i/10 + '0';
        path[3] = i%10 + '0';
        path[4] = 0;
        strcat(path, ".txt");
        fprintf(in, "%s\n", path);
        ff = fopen(path, "w");
        c = rand()%10;
        for(j = 0; j < N; ++j) {
            fprintf(ff, "%d ", c);
            c -= rand()%2 + 1;
        }
        fclose(ff);
    }
    fclose(in);
}

int
get_min(int *date, int *tr, int l, int r)
{
    int ans = tr[l];
    for(; l <= r; l >>= 1, r >>= 1) {
        if(l & 1) {
            if(date[ans] > date[tr[l]]) {
                ans = tr[l];
            }
            ++l;
        }
        if(!(r & 1)) {
            if(date[ans] > date[tr[r]]) {
                ans = tr[r];
            }
            --r;
        }
    }
    return ans;
}

void
change_min(int *date, int *tr, int i)
{
    int op1, op2;
    for(i >>= 1; i; i >>= 1) {
        op1 = tr[(i << 1)];
        op2 = tr[(i << 1) + 1];
        if(date[op1] < date[op2]) {
            tr[i] = op1;
        } else {
            tr[i] = op2;
        }
    }
}

int
get_max(int *date, int *tr, int l, int r)
{
    int ans = tr[l];
    for(; l <= r; l >>= 1, r >>= 1) {
        if(l & 1) {
            if(date[ans] < date[tr[l]]) {
                ans = tr[l];
            }
            ++l;
        }
        if(!(r & 1)) {
            if(date[ans] < date[tr[r]]) {
                ans = tr[r];
            }
            --r;
        }
    }
    return ans;
}

void
change_max(int *date, int *tr, int i)
{
    int op1, op2;
    for(i >>= 1; i > 0; i >>= 1) {
        op1 = tr[(i << 1)];
        op2 = tr[(i << 1) + 1];
        if(date[op1] > date[op2]) {
            tr[i] = op1;
        } else {
            tr[i] = op2;
        }
    }
}

int
main(void)
{
    freopen("input.txt", "r", stdin);

    //my_gen(100, 1000);
    //return 0;
    enum
    {
        MAX_LEN_PATH = FILENAME_MAX + 2,
        MAX_OPEN_FILES = 100,
        MAX_NUM_FROM_FILES = 4
    };

    int i, j;
    char path[MAX_OPEN_FILES][MAX_LEN_PATH];
    int len, num = 0;

    fgets(path[num], MAX_LEN_PATH, stdin);
    while(!feof(stdin)) {
        len = strlen(path[num]);
        if(len && path[num][len-1] == '\n') {
            path[num][--len] = 0;
        }
        if(len && path[num][len-1] == '\r') {
            path[num][--len] = 0;
        }

        if(len) {
            ++num;
        }
        fgets(path[num], MAX_LEN_PATH, stdin);
    }

    long pos[MAX_OPEN_FILES];
    int  date[MAX_OPEN_FILES];
    int tr_mn[1000], tr_mx[1000], sz = 128;

    for(i = 0; i < num; ++i) {
        tr_mn[i + sz] = tr_mx[i + sz] = i;
    }
    for(i = num; i < sz; ++i) {
        tr_mn[i + sz] = tr_mx[i + sz] = num-1;
    }

    for(i=0; i<num; ++i) {
        pos[i] = 0;
    }

    printf("num=%d\n", num);
    FILE *in = NULL;
    int fli = 0;
    for(i = 0; i < num; ++i) {
        in = fopen(path[i], "r");
        if(fscanf(in, "%d", &date[i]) <= 0) {
            fclose(in);
            printf("\n");
            return 0;
        }
        pos[i] = ftell(in);
        fclose(in);
    }
    for(i = 0; i < num; ++i) {

        change_max(date, tr_mx, i+sz);
        change_min(date, tr_mn, i+sz);
    }
   // my_func(path, num);

    int mn, mx;
    while(1) {
        mn = mx = 0;
        /*for(i = 1; i < num; ++i) {
            if(date[i] > date[mx]) {
                mx = i;
            }
            if(date[i] < date[mn]) {
                mn = i;
            }
        }*/
        mn = get_min(date, tr_mn, sz, sz+num-1);
        mx = get_max(date, tr_mx, sz, sz+num-1);

        //printf("\n");
       // printf("%d %d\n", date[mn], date[tr_mn[1]]);
        /*if( date[mn] != date[get_min(date, tr_mn, sz, sz+num-1)] ) {
            printf("BAD1\n");
        }
        if( date[mx] != date[get_max(date, tr_mx, sz, sz+num-1)] ) {
            printf("BAD2\n");
            printf("%d %d\n", date[mx], date[tr_mx[1]]);
            printf("mx=%d %d\n", mx, tr_mx[1]);
            for(i=0; i<num; ++i) {
                printf("%d ", date[i]);
            }
            for(i = 0; i < num; ++i) {
                change_max(date, tr_mx, i+sz);
                change_min(date, tr_mn, i+sz);
            }
            printf("\n%d %d\n", date[mx] , date[tr_mx[1]]);



            return 0;
        }*/
        //return 0;
        //mx = tr_mx[1];
        //mn = get_min(date, tr_mn, sz, 2*sz-1);
    //    mn = get_min(date, tr_mn, sz, 2*sz-1);
        //mx = get_max(date, tr_mx, sz, 2*sz-1);
        //printf("%d %d\n", mn, mx);
        if(date[mn] == date[mx]) {
            //printf("%d ", date[0]);
            for(i = 0; i < num; ++i) {
                in = fopen(path[i], "r");
                fseek(in, pos[i], SEEK_SET);

                if(fscanf(in, "%d", &date[i]) <= 0) {
                    fclose(in);
                    printf("\n");
                    return 0;
                }

                pos[i] = ftell(in);
                fclose(in);
            }
            for(i = 0; i < num; ++i) {
                change_max(date, tr_mx, i+sz);
                change_min(date, tr_mn, i+sz);
            }
        } else {
            in = fopen(path[mx], "r");
            fseek(in, pos[mx], SEEK_SET);

            if(fscanf(in, "%d", &date[mx]) <= 0) {
                fclose(in);
                break;
            }

            change_max(date, tr_mx, mx+sz);
            change_min(date, tr_mn, mx+sz);

            pos[mx] = ftell(in);
            fclose(in);
        }
    }



    return 0;
}