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

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

#include<iostream> using namespace std; int main(){ char n; cin>>n; if(int(n)>=97&&int(n)<=97+25){ cout<<char(int(n-(97-65))); } else{ cout<<char(int(n+(97-65))); } }

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