#include<bits/stdc++.h>
using namespace std;
void printing(int *a,int n,int key, int i){
if(i==n){
return;
}
if(a[i]==key){
cout<<i<<" ";
}
printing(a,n,key,i+1);
}
int main(){
int a[]={1,2,0,1,3,9,1,40};
printing(a,8,1,0);
return 0;
}
