#include<iostream>
#include<cstdio>
#include<cmath>
#define LL longlong
#define EPS le-8
#define INF 0x7f

using namespace std;
int main(){
	int n;
	scanf("%d",&n);
	if(n < 0) n = fabs(n);
	int res = 0;
	while(n > 0){
	int temp = n % 10;
		res = res * 10 + temp;
		n /= 10;
	}
	printf("%d",res);
}