#include<stdio.h>
int main()
{
    int N,i,j=0,x;
    scanf("%d",&N);
    int arr[N],str[N];
    for(i=0;i<N;i++)
        scanf("%d",&arr[i]);
    scanf("%d",&x);
    for(i=0;i<N;i++)
    {
        if(arr[i]==x)
        {
           str[j]=i;
           j++;
        }
    }
    if(j==0)
    {
        printf("NOT FOUND");
    }
    else
    {
        printf("FOUND at index position: ");
        for(i=0;i<j;i++)
        {
            printf("%d",str[i]);
            if(i!=j-1)
                printf(", ");
        }

    }
    return 0;
}