j

#include<iostream>

using namespace std;
char c;

void x(char &c){
cin >> c;
if(c >= 'a' && c <= 'z'){
c = c - 32 ;

}else if(c >= 'A' && c <= 'Z'){
    c = c + 32 ;
    
}
    cout << c <<endl;
}

int main(){
x(c);
return 0;
}