#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

void main()
{
    int thousand = 1000;
    int hundred = 100;
    int ten = 10;

    char a, b, c, d;
    printf("Enter number for thousands: ");
    scanf("%c", &a);

    printf("Enter number for hundreds: ");
    rewind(stdin);
    scanf("%c", &b);


    printf("Enter number for tens: ");
    rewind(stdin);
    scanf("%c", &c);


    printf("Enter number for units: ");
    rewind(stdin);
    scanf("%c", &d);
    rewind(stdin);
    int newNumber = (int)(a-48) * thousand + (int)(b-48) * hundred + (int)(c-48) * ten + (int)(d-48);
    printf("%d", newNumber);
}