public class first_last_occurence_string {

public static void main(String[] args) {

String s = "rohanann";

findOccur(s, 0, 'a');

}

public static int first = -1;

public static int last = -1;

public static void findOccur(String str,int idx,char element){

if(idx == str.length()){

System.out.println(first);

System.out.println(last);

return;

}

char currChar = str.charAt(idx);

if(currChar == element){

if(first == -1)

first = idx;

else last = idx;

}

findOccur(str, idx+1, element);

}

}