#include<iostream>
using namespace std;
int main(){
	char n=0; 
	cin>>n;
    if(n=='a'){
		cout<<"A";
	}else if(n=='A'){
		cout<<"a";
	}else if(n=='b'){
		cout<<"B";
	}else if(n=='B'){
		cout<<"b";
	}else if(n=='c'){
		cout<<"C";
	}else if(n=='C'){
		cout<<"c";
	}else if(n=='d'){
		cout<<"D";
	}else if(n=='D'){
		cout<<"d";
	}else if(n=='e'){
		cout<<"E";
	}else if(n=='E'){
		cout<<"e";
	}else if(n=='f'){
		cout<<"F";
	}else if(n=='F'){
		cout<<"f";
	}else if(n=='g'){
		cout<<"G";
	}else if(n=='G'){
		cout<<"g";
	}else if(n=='h'){
		cout<<"H";
	}else if(n=='H'){
		cout<<"h";
	}else if(n=='i'){
		cout<<"I";
	}else if(n=='j'){
		cout<<"J";
	}else if(n=='J'){
		cout<<"j";
	}else if(n=='K'){
		cout<<"k";
	}else if(n=='k'){
		cout<<"K";
	}else if(n=='L'){
		cout<<"l";
	}else if(n=='l'){
		cout<<"L";
	}else if(n=='m'){
		cout<<"M";
	}else if(n=='M'){
		cout<<"m";
	}else if(n=='n'){
		cout<<"N";
	}else if(n=='N'){
		cout<<"n";
	}else if(n=='o'){
		cout<<"O";
	}else if(n=='O'){
		cout<<"o";
	}else if(n=='p'){
		cout<<"P";
	}else if(n=='P'){
		cout<<"p";
	}else if(n=='q'){
		cout<<"Q";
	}else if(n=='Q'){
		cout<<"q";
	}else if(n=='r'){
		cout<<"R";
	}else if(n=='R'){
		cout<<"r";
	}else if(n=='s'){
		cout<<"S";
	}else if(n=='S'){
		cout<<"s";
	}else if(n=='t'){
		cout<<"T";
	}else if(n=='T'){
		cout<<"t";
	}else if(n=='u'){
		cout<<"U";
	}else if(n=='U'){
		cout<<"u";
	}else if(n=='v'){
		cout<<"V";
	}else if(n=='V'){
		cout<<"v";
	}else if(n=='w'){
		cout<<"W";
	}else if(n=='W'){
		cout<<"w";
	}else if(n=='x'){
		cout<<"X";
	}else if(n=='X'){
		cout<<"x";
	}else if(n=='y'){
		cout<<"Y";
	}else if(n=='Y'){
		cout<<"y";
	}else if(n=='z'){
		cout<<"Z";
	}else if(n=='Z'){
		cout<<"z";
	}
	
	return 0;
}