Help me in solving CHEFSTLT problem

help
,
1

My issue

it is showing nosuchelementfound
what should i do

My code

import java.util.*;
class Main
{
	public static void main (String[] args)
	{
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		sc.nextLine();
		while(t-->=0){
		    String s1=sc.nextLine();
		    String s2=sc.nextLine();
		    int min=0;
		    int max=0;
		    for(int i=0;i<s1.length();i++){
		        char c1=s1.charAt(i);
		        char c2=s2.charAt(i);
		        if(c1=='?'&&c2=='?'){
		            max+=2;
		        }else if(c1=='?'||c2=='?'){
		            max+=2;
		        }else if(c1!=c2){
		            min+=1;
		            max+=1;
		        }
		    }
		    System.out.println(min+" "+max);
		}
		sc.close();
	}
}

Learning course: Roadmap to 3*
Problem Link: https://www.codechef.com/learn/course/klu-roadmap-3star/KLURMP300A/problems/CHEFSTLT