#include <stdio.h>
#include <string.h>

int main()
{
    int array[20];
    int i,in,key;
    int yesno = 0;
    memset(array, -1, sizeof(array));
    printf("個数？：");
    scanf("%d",&in);
    if(in < 0 || in > 20) return 0;
              /* in = 20; */
    printf("-1で強制終了：");
    for(i=0; i<in; i++) {
        scanf("%d",&array[i]);
        if(array[i] == -1) break;
    }
    printf("キー？：");
    scanf("%d",&key);
    for(i=19; i>=0; i--) {
        if(array[i] == key) { yesno = 1; printf("yes\t"); printf("%d番目\n", i+1); }
        else if(array[i] != -1) { printf("%d\n",array[i]); }
    }
    if(yesno == 0) { printf("no"); }
}