#define _CRT_SECURE_NO_WARNINGS 1 
#include <stdio.h>
int main()
{
    int count = 0;
    int arr[9] = { 1,2,3,4,5,1,2,3,4 };
    for (int i = 0; i < 9; i++)
    {
        count = 0;
        int tmp = arr[i];
        for (int j = 0; j < 9; j++)
        {
            
            if (tmp == arr[j])
            {  
                count++;    
            }
          
        }
        if (count == 1)
        {
            printf("%d", tmp);
        }
    }

}