#include <stdlib.h>
#include <stdio.h>

enum {INF = 1000*1000*1000};

void readOne(FILE *inp, int *to){
    if (fscanf(inp, "%d", to) < 1)
        *to = INF;
}

int getMin(int *arr, int count){
    int i, min = 0;
    for (i = 1; i < count; i++)
        if (arr[i] < arr[min])
            min = i;
    return min;
}

int main(int argc, char **argv){
    if (argc < 2)
        return 0;
    FILE **inps = (FILE **)malloc((argc - 1) * sizeof(FILE *));
    int *cur = (int *)malloc((argc - 1) * sizeof(int));
    int i, min;
    for (i = 0; i < argc - 1; i++){
        inps[i] = fopen(argv[i + 1], "r");
        readOne(inps[i], &cur[i]);
    }
    while (cur[min = getMin(cur, argc - 1)] != INF){
        printf("%d ", cur[min]);
        readOne(inps[min], &cur[min]);
    }
    return 0;
}