#include <iostream>
#include <string>
using namespace std;
int main() {
int n, idx1=-1, idx2=-1;
string str;
cin>>n;
for(int i=0;i<n;i++){
string s;
cin>>s;
if(s=="KBS1")
idx1=i;
else if(s=="KBS2")
idx2=i;
}
int order=idx1>idx2? 1:0;
for(int i=0;i<idx1;i++)
cout<<1;
for(int i=0;i<idx1;i++)
cout<<4;
for(int i=0;i<idx2+order;i++)
cout<<1;
for(int i=0;i<idx2+order-1;i++)
cout<<4;
return 0;
}
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