#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    int rem;
    int original=n;
    int reversed=0;
    while(n>=0){
        printf("Invalid input");
    }
    do{
    rem=n%10;
    reversed=reversed*10+rem;
    n=n/10;
    printf("%d",rem);
    }
    return 0;
}