UVa 10222 - Decode the Mad man

// UVa 10222 - Decode the Mad man

#include <string>
#include <iostream>
#include <map>
using namespace std;

const string keyboard = "`1234567890-=qwertyuiop[]\\asdfghjkl;'zxcvbnm,./";

int main() {

	map<char, int> idx;
	for (int i = 0; i < keyboard.length(); i++)
		idx[keyboard[i]] = i;

	string line;
	while (getline(cin, line)) {
		for (int i = 0; i < line.length(); i++) {
			if ('A' <= line[i] && line[i] <= 'Z')
				line[i] = line[i] - 'A' + 'a';
			int new_idx = idx[line[i]] - 2;
			if (0 <= new_idx && new_idx < keyboard.length())
				cout << keyboard[new_idx];
			else
				cout << line[i];
		}
		cout << endl;
	}
	return 0;
}