C :

#include<stdio.h>
int main(){
char c;
c=getchar();
printf("%c\n",c+32);
return 0;
}

C++ :

#include <stdio.h>
#include <math.h>
int main() {
	char a;
	a = getchar();
	a += 'a' - 'A';
	printf("%c\n", a);
	return 0;
}

Pascal :

var a:char;
begin
  readln(a);
  writeln(chr(ord(a)+32));
end.

Java :

import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner cin=new Scanner(System.in);
		String s=cin.next();
		System.out.printf("%s\n",s.toLowerCase());
	}
}

Python :

print raw_input().lower()