# include<iostream> # include<cstdio> # include<iomanip> using namespace std; int main(){ char x,y; cin>>x; if(x>='a'){ if(x<='z'){ x=x-32; cout<<x; } } else{ if(x>='A'){ if(x>='Z'){ x=x+32; cout<<x; } } } return 0; }