public class Main1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String a="abcdef";
        String b="g";
        System.out.println(indexof(a, b));
    }
    public static int  indexof(String s1, String s2){
        char[] a=s1.toCharArray();
        char
 
[] b=s2.toCharArray();
        boolean state=false;
        int indexofvalue=0;
        for (int i = 0; i < a.length-b.length+1; i++) {
//          System.out.println("i="+i);
            indexofvalue=i+1;
            for (int j = 0; j < b.length; j++) {
//              System.out.println("j="+j);
                if
 
(b[j]==a[j+i]){
                    state=true;
                }else{
                    state=false;
                    break;
                }
            }
            if(state==true){
                return indexofvalue;
            }
        }
        if(indexofvalue==a.length||state==false
 
){
            return -1;
        }else{
            return indexofvalue;
        }
    }
}