#include<bits/stdc++.h> using namespace std; int main(){ string s; getline(cin,s); int y=s.size(); for(int i=0;i<=y-1;i++){ if(s[i]>='a' and s[i]<='z'){ s[i]-=32; }else if(s[i]>='A' and s[i]<='Z'){ s[i]+=32; } cout<<s[i]; } return 0; }