Codeforces 131A. cAPS lOCK Solution
///La ilaha illellahu muhammadur rasulullah
///******Bismillahir-Rahmanir-Rahim******///
///Abul Hasnat Tonmoy
///Department of CSE,23rd batch
///Islamic University,Bangladesh
#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;
int i,n,len,j,up=0,lw=0,c=0,c1=0;
cin>>s;
len=s.size();
for(i=0; i<len; i++)
{
if(s[i]<91)
up++;
}
if((up==len)||((s[0]>91)&&(len-1==up)))
{
for(i=0; i<len; i++)
{
if(s[i]>91)
s[i]=s[i]-32;
else
s[i]=s[i]+32;
}
}
cout<<s<<endl;
}
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