// text = String given
for (int i = 0; i < text.length(); i++) {
	char c = text.charAt(i);
	if (!(c >= 'a' && c <= 'z') && 	// if c is not a lower-case letter
	    !(c >= 'A' && c <= 'Z') &&	// and c is not an upper-case letter
	    !(c >= '0' && c <= '9'))  	// and c is not a digit,
		System.out.print(c);    	// print out c
}

// number = String containing only positive digits
int powOfTen = 10;

// get the ones position and add it to num
int num = number.charAt(number.length() - 1) - '0';

// working backwards through the string, get the next digit,
// multiply it by the appropriate power of 10, and add it in to num
for (int i = number.length() - 2; i >= 0; i--) {
	num += (number.charAt(i) - '0') * powOfTen;
	powOfTen *= 10;
}
	

// number = String containing only digits

int firstDigit = 0; // position of first digit in the string
int sign = 1;       // multiply by the sign at the end

// check for + or - at the beginning of the string
if (number.charAt(0) == '-') {
	sign = -1;
	firstDigit = 1;
}
else if (number.charAt(0) == '+') {
	firstDigit = 1;
}

// calculate number as in question 3
int num = number.charAt(number.length() - 1) - '0';
int powOfTen = 10;
for (int i = number.length() - 2; i >= firstDigit; i--) {
	num += (number.charAt(i) - '0') * powOfTen;
	powOfTen *= 10;
}
 
num *= sign;  // multiply by the sign
	

phrase.setCharAt(7, 'd');
phrase.setCharAt(8, 'o');
phrase.append("ey");
phrase.insert(3, 'l');
	

public class Date {
	private int month, day, year;  // holds month, day, year for date

	/**
	 * Creates a Date object with the given month, day, and year.  
	 * Invalid arguments are replaced with 0.
	 *
	 * @param m the month (1 <= m <= 12)
	 * @param d the day (1 <= d <= 31)
	 * @param y the year (1000 <= y <= 9999)
	 **/
	public Date(int m, int d, int y) {
		month = m;
		if (month < 1 || month > 12)
			month = 0;
		day = d;
		if (day < 1 || day > 31)
			day = 0;
		year = y;
		if (year < 1000 || year > 9999)
			year = 0;
	}

	/**
	 * Returns the month.
	 * @return the month
	 **/
	public int getMonth() {
		return month;
	}

	/**
	 * Returns the day.
	 * @return the day
	 **/
	public int getDay() {
		return day;
	}

	/**
	 * Returns the year.
	 * @return the year
	 **/
	public int getYear() {
		return year;
	}

	/**
	 * Returns a String representing the date.
	 * @return the date in the format: mm/dd/yyyy
	public String toString() {
		return (month + "/" + day + "/" + year);
	}
}