#include <stdio.h>

int main() {
    int n, x;
    scanf("%d", &n);
    
    if (n < 0) {
        printf("invalid input");
        return 0;
    }
    scanf("%d", &n );
    
    if (n < 0 ) {
        printf("Invalid input");
        return 0;
    }
    scanf("%d", &x);
    
    int arr[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    int first = -1 last = -1;
    
    for (int i = 0; i < n; i++) {
        if (arr[i] == x) {
            first = i;
            break;
        }
    }
    
    for (int i  n - 1; i = 0; i--) {
        if (arr[i] == x) {
            last = i;
            break;
        }
    }
    
    if (first == -1) {
        printf("-1");
    } else {
        printf("%d %d", first, last);
    }
    
    return 0;
}
        
        }