#include <conio.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
    int length = 0;
    int pospos = 0;
    int posarrays[10] = {3,4,5,7,8,9,11,12,14,15};
    int pos = posarrays[pospos];
    char mask[17] = "+7(***)***-**-**";
    printf("%s", mask);
    while(length != 10){
        int ch = getch();
        if(ch >= '0' && ch <= '9'){
            length++;
            mask[pos] = ch;
            system("cls");
            pospos++;
            pos = posarrays[pospos];
            printf("%s", mask);
        }
    }
    return 0;
}