Soundex in c++

[Primobmx1989]

I got most of it working but I cant find a good way for it to end the program at the end of the word and if its less than 4 letters to add 0's at the end. so for i got

//Generate Soundex Code
#include <iostream>
#include <ctype.h>
using namespace std;
int main()
{
    char first,letter;
    int count=1, leftover;
    cin>>first;
    cout<<first;
    do  {    
        cin>>letter;
        switch (letter)
        {
            case 'b':
            case 'f':
            case 'p':
            case 'v':
            case 'B':
            case 'F':
            case 'P':
            case 'V':
                cout<<"1";
                count++;
                break;
            case 'c':
            case 'g':
            case 'j':
            case 'k':
            case 'q':
            case 's':
            case 'x':
            case 'z':
            case 'C':
            case 'G':
            case 'J':
            case 'K':
            case 'Q':
            case 'S':
            case 'X':
            case 'Z':
                cout<< "2";
                count++;
                break;
            case 'd':
            case 'D':
            case 't':
            case 'T':
                cout<<"3";
                count++;
                break;
            case 'l':
            case 'L':
                cout<<"4";
                count++;
                break;
            case 'm':
            case 'M':
            case 'N':
            case 'n':
                cout<<"5";
                count++;
                break;
            case 'r':
            case 'R':
                cout<<"6";
                count++;
                break;
}
        } while ((iscntrl(letter)) or (count=4));
        for(leftover=count;leftover<4;leftover++);
            {
            cout<<"0";
            }
    cout<<endl;
}

the counter or the leftover isnt working right and like for the name Wilbur is does W4160 and makes it 5 but for Eib it just does E1 and dosnt add any 0's ty in advance