language: C++ 4.7.2 (gcc-4.7.2)
date: 598 days 17 hours ago
link:
visibility: public 
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#include <iostream>
#include <cctype>
#include <algorithm>
#include <vector>
 
struct numeric_only: std::ctype<char> 
{
    numeric_only(): std::ctype<char>(get_table()) {}
 
    static std::ctype_base::mask const* get_table()
    {
        static std::vector<std::ctype_base::mask> 
            rc(std::ctype<char>::table_size,std::ctype_base::space);
 
        std::fill(&rc['0'], &rc[':'], std::ctype_base::digit);
        return &rc[0];
    }
};
 
 
int main() {
        int num;
        std::cin.imbue(std::locale(std::locale(), new numeric_only()));
        while ( std::cin >> num)
             std::cout << num << std::endl;
        return 0;
}