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

int main() 
{
    int n;
    scanf("%d",&n);

    int result  = 0;
    bool num[10] = {false};

    while (n > 0)
    {
        int i = n%10;

        if(num[i] == false)
        {
            num[i] = true;
            result = result * 10 + i;
        }
        
        n /= 10;
    }

    printf("%d",result);

    return 0;
}