tj

#include<bits/stdc++.h>
using namespace std;
string s;
int main(){
	cin>>s;
	//getline(cin,s);
	int len = s.size();
	for(int i=0;i<=len-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;
	return 0;
}