#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
int top = -1, stack[100];
void Push(int x) {
    stack[++top] = x;
}
int Pop() {
    return stack[top--];
}
int Peek() {
    return stack[top];
}
void problema()
{
    int i;
    int j = 0;
    char x[30] = "0xAABBCCDD";
    char prg[30];
    for(i=0;i<strlen(x);i++)
    {
        if (i == strlen(x)-1)
        {
            Push(x[i]);
            prg[j++] = Pop();
            Push(x[i - 1]);
            prg[j++] = Pop();
        }
        if(i==strlen(x)-3)
        {
            Push(x[i]);
            prg[j++] = Pop();
            Push(x[i - 1]);
            prg[j++] = Pop();
        }
        if (i == strlen(x) - 5)
        {
            Push(x[i]);
            prg[j++] = Pop();
            Push(x[i - 1]);
            prg[j++] = Pop();
        }if (i == strlen(x) - 7)
        {
            Push(x[i]);
            prg[j++] = Pop();
            Push(x[i - 1]);
            prg[j++] = Pop();
        }
    }
    for (i = 0; i < 9; i++) {
        printf("%c", prg[i]);
    }
}

int main()
{
    problema();
    system("pause");
    return 0;

}