C++ :

#include<iostream>
using namespace std;
int a[101],i,j;
int main()
{
    while(cin>>a[i])
    {
        i++;
    }
    for(j=0;j<=i;j++)
    {
        if(a[j]==0){break;}
    }
    cout<<j+1;
    return 0;
}

Python :

# coding=utf-8
string=input()
lis=string.split()
cnt=1
for i in lis:
    if i=="0":
        break
    cnt+=1
print(cnt)