#include <iostream>
using namespace std;
int a,b,p=1,i=0;
bool p1=1;
int main()
{
while(p1==1)
{
cin>>a;
if(i>=3&&b!=42&&a==42)
{
p1=0;
cout<<a;
}
if(p1!=0)
{
cout<<a<<endl;
}
if(a==42&&b!=42){i++;}
b=a;
}
return 0;
}
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