#include <iostream>
using namespace std;
int numa,numb;//全局变量自动赋值0
int main(){
	cin>>numa;  
	while(numa!=0){//0在这一步被筛掉
		numb=numb*10+numa%10;
		numa/=10; 
	} 
    cout<<numb;
    return 0; //做题养成好习惯~
}