#include <iostream>
#include <string>

int main(){
  constexpr const char a = 'a';
  constexpr const char z = 'z';
  constexpr const char A = 'A';
  constexpr const char Z = 'Z';
  constexpr const char to_capital = A - a;
  
  std::string S;
  std::cin >> S;
  
  for(char& c : S){
    if(a <= c && c <= z){
      c += to_capital;
    }else{
      c -= to_capital;
    }
  }
  std::cout << S << std::endl;
  
  return 0;
}