One in Another in java

Here you are given with two inputs one is alpha numeric and other is just number in the form of string. Now you have to check the numeric value in first string is present in second string. If it is present you need to get the index of it.

	import java.util.*;
	public class OneInAnother {
	public static int oneInAnother(String input1,String input2)
	{
	int index=0;
	String [] first=input1.split("");
	String [] second=input2.split("");
	for(int i=0;i<second.length;i++){
	String x=String.valueOf(second[i]);
	for(int j=0;j<first.length;j++){
	String y=String.valueOf(first[j]);
	if(x.equals(y)){
	index=j;
	break;
	}
	}
	if(index>0)
	break;
	}
	return index;
	}
	public static void main(String [] args){
	Scanner in = new Scanner(System.in);
	int output = 0;
	String ip1 = in.nextLine().trim();
	String ip2 = in.nextLine().trim();
	output = oneInAnother(ip1,ip2);
	System.out.println(String.valueOf(output));
	}
	}

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Input
abc6efg
123678

Output:
3

Input:
a1bc6ef
123678

Output:
1