#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a,b,c,n; cin>>a; if(a<='a'){ cout<<(char) (a+('A'-'a')); } else if(a>='A'){ cout<<(char) (a-('A'-'a')); } return 0; }