Main

class Main {

public static void main(String[] args) {

char letter = 'b';

char[] letters = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };

int result = findLetterBackwards(letter, letters);

System.out.println(result);

}

public static int findIndex(char letter, char[] letters){

if (letters == null )

return -1;

int res = -1;

for(int i = 0; i < letters.length; i++){

if(letters[i] == letter){

res = i;

}

}

return res;

}

public static int findLetterBackwards(char letter, char[] letters){

int res = -1;

for(int i = letters.length-1; i <= 0; i--){

if(letters[i] == letter){

res = i;

}

}

return res;

}

}