#include <iostream>
#include <algorithm>
#include <cctype>
#include <ios>
 
bool isNumber(std::string const &str)
{
    bool isNegative = (str[0] == '-');
    bool metDecimalDot = false;
    return std::all_of(str.cbegin() + isNegative, str.cend(), [&](char ch) {
        return isdigit(ch) || (!metDecimalDot && (metDecimalDot = (ch == '.')));
    });
}
 
int main() {
	std::string input;
	while (std::cin >> input) {
		std::cout << std::boolalpha << "Is '" << input << "' a number? " << isNumber(input) << "\n";
	}
	return 0;
}

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MQo0MgozLjAwCjMuMTQKMy4xNDAwCjMuMTQuMTUKYWRzZgpACi4=

1
42
3.00
3.14
3.1400
3.14.15
adsf
@
.