#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a[81];
	cin>>a;
	for(int i=0;a[i]!='\0';i++)
	{
		if(a[i]>='a'&&a[i]<='z')
		{
			cout<<char(a[i]-32);
		}else if(a[i]>='A'&&a[i]<='Z')
		{
			cout<<char(a[i]+32);
		}else{
			cout<<a[i];
		}
	} 

	return 0;
}


/**************************************************************
	Problem: 1182
	User: lzc
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/