A. cAPS lOCK1000 / 水题

Posted 2021-10-02 幽殇默

https://codeforces.com/problemset/problem/131/A

#include<bits/stdc++.h>
using namespace std;
int cnt;
int main(void)
{
	string s; cin>>s;
	for(int i=0;i<s.size();i++) if(s[i]<='Z') cnt++;
	if(cnt==s.size()||( (cnt==s.size()-1) && (s[0]>='a') ) )
	{
		for(int i=0;i<s.size();i++) 
		{
			if(s[i]>='a') s[i]=toupper(s[i]);
			else s[i]=tolower(s[i]);
		}
	}
	cout<<s<<endl;
	return 0;
}