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