#include<iostream> #include<string> using namespace std; string reverse(string s){ for(int i=0;i<s.size();i++){ if(s[i]>='A'&&s[i]<='Z')s[i]+=32; else if(s[i]>='a'&&s[i]<='z')s[i]-=32; } return s; } int main(){ string s; cin>>s; cout<<reverse(s); return 0; }