#include <iostream>
#include <fstream>
#include <locale>
#include <string>
#include <iomanip>

using namespace std;

//Function Prototypes
char GetNumber(char letter);

int main(){
    //Program Variangles
    string phone_number;
    string output_number = "";
    int num_length;
    bool leading_one = false;

    //Declare and Open Input File
    ifstream in_file;
    in_file.open("mp4phoneinput.txt");

    //Loop through the file
    while (in_file && !(in_file.eof())){
        //Get the current line
        getline(in_file, phone_number);
        num_length = phone_number.length();

        //Dont display empty lines
        if (num_length > 0){
            //Echo current line
            cout << phone_number << setw(20-num_length)
                 << setfill(' ') << " -> ";

            //Check for leading 1
            char lead_char = phone_number.at(0);
            if (lead_char == '1')
                leading_one = true;

            //Loop through string and convert letters to numbers
            //If there IS a leading one, start a char ahead
            for (int i = leading_one; i < num_length; i++){
                char cur_letter = phone_number.at(i);
                if (cur_letter != '-')      //Dont parse hyphens
                    output_number += GetNumber(cur_letter);
            }

            //Format Output
            if (leading_one){
                output_number = "1-" + output_number;
                output_number.insert(5, "-");
                output_number.insert(9, "-");

                //Truncate extra numbers
                if (output_number.length() > 14)
                    output_number.erase(14, output_number.length());
                cout << output_number;
            }else{
                output_number.insert(3, "-");
                output_number.insert(7, "-");

                //Truncate extra numbers
                if (output_number.length() > 12)
                    output_number.erase(12, output_number.length());
                cout << "  " << output_number;
            }

            //Reset loop variables
            output_number = "";
            leading_one = false;
            cout << "\n\n";
        }
    }
    return 0;
}

//Conversion function:
//converts chars to appropriate number
char GetNumber(char letter){
    letter = tolower(letter);
    switch(letter){
        case 'a':
        case 'b':
        case 'c': return '2'; break;
        case 'd':
        case 'e':
        case 'f': return '3'; break;
        case 'g':
        case 'h':
        case 'i': return '4'; break;
        case 'j':
        case 'k':
        case 'l': return '5'; break;
        case 'm':
        case 'n':
        case 'o': return '6'; break;
        case 'p':
        case 'q':
        case 'r':
        case 's': return '7'; break;
        case 't':
        case 'u':
        case 'v': return '8'; break;
        case 'w':
        case 'x':
        case 'y':
        case 'z': return '9'; break;
        //If not a letter, return argument
        default: return letter;
    }
}