#include<bits/stdc++.h> using namespace std; char s; int main() { cin>>s; if(s<='z'&&s>='a')s=s-32; else if(s<='Z'&&s>='A')s=s+32; cout<<s; return 0; }

#include<bits/stdc++.h> using namespace std; char a; int main(){ cin >> a; if(a >= 'a' && a <= 'z'){ a = a - 32; cout << a; }else if(a >= 'A' && a <= 'Z'){ a = a + 32; cout << a; }else{ cout << a; } return 0; }