import java.util.*;
import java.lang.*;
 
class Main
{
	public static void main(String[] args) throws java.lang.Exception
	{
		String a = "zappaz";
        String b = "not";
 
        System.out.println(containsDouble(a, 'z'));
        System.out.println(containsDouble(b, 'z'));
	}
 
    private static boolean containsDouble(String s, char letter) {
        int firstIndex = s.indexOf(letter);
 
        return firstIndex > -1 && s.indexOf(letter, firstIndex + 1) > -1;
    }
}

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