#include<stdio.h>
int main()
{
    int n,b=0,c=1;
    scanf("%d",&n);
    scanf("%d",&n);
    for(int temp=n<0?-n:n;temp>0;temp/-10);
    {
        b=(temp%10==0?1:temp%10)*c+b;
        c*=10;
    }printf("%d",n<0?-b:b);
}