#include <iostream>
#include <fstream>

using namespace std;

const int SIZE = 1000;
const string ERROR_NOT_OPEN = "File isn't open!";

bool isExpression(char** str);
bool isMantissa(char** str);
bool isOrder(char** str);
bool isUnsignedInteger(char** str);
bool isNumber(char** str);
bool isSign(char** str);

bool isExpression(char** str)
{
	isSign(str);
	if (isMantissa(str))
		if (isOrder(str))
			return true;

	return false;
}

bool isMantissa(char** str)
{
	isUnsignedInteger(str);
	if (**str == '.')
	{
		(*str)++;
		if (isUnsignedInteger(str))
			return true;
	}

	return false;
}

bool isOrder(char** str)
{
	if (**str == 'E' || **str == 'e')
	{
		(*str)++;
		if (isSign(str))
			if (isUnsignedInteger(str))
				return true;
	}

	return false;
}

bool isUnsignedInteger(char** str)
{
	if (isNumber(str))
	{
		isUnsignedInteger(str);
		return true;
	}

	return false;
}

bool isNumber(char** str)
{
	if (**str >= '0' && **str <= '9')
	{
		(*str)++;
		return true;
	}

	return false;
}

bool isSign(char** str)
{
	if ((**str == '-') || (**str == '+'))
	{
		(*str)++;
		return true;
	}

	return false;
}

int main()
{
	setlocale(LC_ALL, "rus");

	try
	{
		fstream input;
		input.open("input.txt");
		if (!input)
			throw ERROR_NOT_OPEN;

		while (!input.eof())
		{
			char* str = new char[SIZE + 1];
			input.getline(str, SIZE + 1);
			char* str1 = str;
			bool answer = isExpression(&str);

			if (answer && str[0] != '\0')
			{
				answer = false;
			}
			if (answer)
				cout << "Yep" << endl;
			else
				cout << "Np" << endl;
			str = str1;

			delete[] str;
		}

		input.close();

		return 0;
	}
	catch (const string& errorS)
	{
		cerr << endl << errorS << endl;
		return -1;
	}
}