#include <iostream>
#include <cstring>

using namespace std;

int apcar(char *s, int x)
{
    int cnt = 0;
    char *p = strchr(s,x);
    while(p != NULL)
    {
        cnt ++ ;
        p = strchr(p + 1, x);
    }

    return cnt;
}

int main()
{
    char s[256], *p, v[101][16];
    cin.getline(s, 256);
    int n = 0;
    p = strtok(s," ");
    while(p)
    {
        bool gasit = false;
        for(int i = 1; i <= n ; i ++)
            if(strcmp(v[i],p) == 0)
                gasit = true;
        if(!gasit)
            strcpy(v[++n], p);

        p = strtok(NULL, " ");


    }
    for(int i = 1; i< n; i ++)
        for(int j = i + 1; j <= n; j ++)
            if(strcmp(v[i],v[j]) > 0)
    {
        char t[16];
        strcpy(t,v[i]);
        strcpy(v[i], v[j]);
        strcpy(v[j], t);
    }

    for(int i =1; i <= n ; i ++)
        cout << v[i] << '\n';
    return 0;
}