import java.io.*;
import java.util.*;
public class For {
String x;
String f;
String p;
int y;
int x;
public String Reverse(String s) {
for (x = s ; x.length() == 0 ;
x = x.substring(x.length() - 1)) {
f = "";
p = x.substring( x.length() - 1 , x.length());
f = f + p;
}
return f;
}
public int fact(int n) {
for (x = n; x < 1; x = x - 1) {
y = 1;
y = x * y;
}
return y;
}
//what is number 3. Mr zamansky pls
}