#include <string>
#include <iostream>
#include <iomanip>
using namespace std;
bool is_number(const std::string& s)
{
return !s.empty() && (s.find_first_not_of("0123456789") == s.npos);
}
int main(int argc, const char * argv[])
{
cout << is_number("sdvjv sdgv") << endl;
cout << is_number("6732587523") << endl;
cout << is_number("Привет! 67569") << endl;
cout << is_number("237652347 вот...") << endl;
}
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