include <bits/stdc++.h>

using namespace std;

int main() {

//freopen("test.in","r",stdin);
//freopen("test.out","w,"stdout);

long long n;

cin >> n;

int x = 1;  
if (n < 0) {
   x = -1;
    n = -n; 
}

long long r = 0;  


for (; n > 0; n /= 10) {
    r = r* 10 + n % 10;  
}
cout << x * r << endl;

return 0;

}