#include<stdio.h>
main()
{
    int n,a;
    scanf("%d",&n);
    a=0;
    while(n>10)
    {
        a=n%10;
        n=n/10;
        if(a==0)
        {
            continue;
        }
        else
        printf("%d",a);
        
    }
    printf("%d",n);
}