#include <iostream>
#include <iterator>
#include <algorithm>
bool isNumber( const std::string& s )
{
for( std::string::const_iterator it=s.begin(); it!=s.end(); ++it )
{
if( !std::isdigit(*it) ) return false;
}
return true;
}
bool printNumbersOnly( std::istream_iterator<std::string>& it )
{
bool nothing = true;
std::istream_iterator<std::string> eos;
while( it != eos )
{
if( *it == "end" ) break;
if( isNumber(*it) )
{
nothing = false;
std::cout << *it << std::endl;
}
++it;
}
return !nothing;
}
int main() {
std::istream_iterator<std::string> iit(std::cin);
if( !printNumbersOnly( iit ) ) std::cout << "nothing\n";
return 0;
}
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