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