C++ :

#include<iostream>
#include<string>
using namespace std;
int main()
{
	string s;
	getline(cin,s);
	for (int i=0; s[i]!='\0'; i++)
		if ((s[i]>='a'&&s[i]<='y') || (s[i]>='A'&&s[i]<='Y'))
			s[i]++;
		else if (s[i]=='z' || s[i]=='Z')
			s[i]-=25;
	cout<<s<<endl;
	return 0;
}