poj 1298 The Hardest Problem Ever

#include<iostream>
#include<string>
using namespace std;
int main()
{
string start,str,end;
while(cin>>start&&start!="ENDOFINPUT")
    {
        scanf("\n");
        getline(cin,str);
for(int i=0;i<str.size();i++)
        {
if(str[i]>='A'&&str[i]<='E')
                cout<<(char)(str[i]+21);
else if(str[i]>='F'&&str[i]<='Z')
                cout<<(char)(str[i]-5);
else cout<<str[i];
        }
        cout<<endl;
        cin>>end;    
    }
return 0;
}