#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
#include <math.h>
void intToArr(int x, int* arr){
    for(int i=0;i<4;i++){
        arr[i] = x / pow(10, 3-i);
        x %= (int)pow(10, 3-i);
    }
}

int main(){
    srand(time(0));
    int ans[4], guess[4];
    int Ans, Guess;
    int max = 9999;
    int min = 1000;
    int a, b;
    bool flag;
    int x;
    while(1){
        flag = 0;
        Ans = (max-min) * rand() / (RAND_MAX + 1) + min;
        intToArr(Ans, ans);
        for(int i=0;i<4;i++){
            for(int j=i+1;j<4;j++){
                if(ans[i] == ans[j]){
                    flag = 1;
                    break;
                }
            }
            if(flag) break;
        }
        if(!flag) break;
    }
    printf("The answer is %d\n" , Ans);
    while(1){
        a = b = 0;
        printf("Your guess:");
        scanf("%d", &Guess);
        if(Guess == Ans) break;
        intToArr(Guess, guess);
        for(int i=0;i<4;i++){
            if(ans[i] == guess[i]){
                a++;
                continue;
            }
            for(int j=0;j<4;j++){
                if(guess[i] == ans[j]) b++;
            }
        }
        printf("%dA%dB\n", a, b);
    }

    printf("You guess right!!!\n");

}