#include <cstring>
#include <iostream>
using namespace std;
int main()
{
char a[11]={0},b[11]={0},x[11];
unsigned n;
cin>>n;
while(n--)
{
memset(x,0,sizeof(x));
cin>>x;
for(unsigned i=0;i<10;++i)
{
b[i]^=a[i]&x[i];
a[i]^=x[i]^(b[i]&x[i]);
}
}
cout<<"wynik: "<<a<<endl;
return 0;
}
I2luY2x1ZGUgPGNzdHJpbmc+CiNpbmNsdWRlIDxpb3N0cmVhbT4KdXNpbmcgbmFtZXNwYWNlIHN0ZDsKIAppbnQgbWFpbigpCiAgewogICBjaGFyIGFbMTFdPXswfSxiWzExXT17MH0seFsxMV07CiAgIHVuc2lnbmVkIG47CiAgIGNpbj4+bjsKICAgd2hpbGUobi0tKQogICAgIHsKICAgICAgbWVtc2V0KHgsMCxzaXplb2YoeCkpOwogICAgICBjaW4+Png7ICAgICAKICAgICAgZm9yKHVuc2lnbmVkIGk9MDtpPDEwOysraSkKICAgICAgICB7CiAgICAgICAgIGJbaV1ePWFbaV0meFtpXTsKICAgICAgICAgYVtpXV49eFtpXV4oYltpXSZ4W2ldKTsKICAgICAgICB9CiAgICAgfQogICBjb3V0PDwid3luaWs6ICI8PGE8PGVuZGw7CiAgIHJldHVybiAwOwogIH0=