입력 :
The first line of input contains a single integer N, (1 ≤ N ≤ 1000) which is the number of datasets that follow.
Each dataset consists of a single line of input containing M, a space, and a single word made up of uppercase letters only. M will be less than or equal to the length of the word. The length of the word is guaranteed to be less than or equal to 80.

출력 :
For each dataset, you should generate one line of output with the following values: The dataset
number as a decimal integer (start counting at one), a space, and the misspelled word. The
misspelled word is the input word with the indicated character deleted.

일단 스캐너로 입력할 개수를 받고,
개수만큼 for문을 돌려 각 줄을 입력받음.
입력받은 문자열 중에 소문자가 있는지 체크하고 없으면
문자열 길이 체크, m의 범위 체크한 뒤
Dataset 을 만들어 저장하고, 마지막에 출력
이렇게 만들었는데요, 여러단어들로 테스트 해보니 잘 되는데
계속 채점에서 틀렸다고 뜨네요...
어디가 문제인지 감이 안오네요;

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

public static void main(String[] args) {

    Scanner sc=new Scanner(System.in);
    ArrayList<Dataset> set=new ArrayList<Dataset>();
    Dataset d;
    int n=sc.nextInt();sc.nextLine();

    if(n>=1&&n<=1000){

        for(int i=0;i<n;i++){
            String st=sc.nextLine();
            char[] ch=st.toCharArray();
            boolean upperChk=true;

            for(int j=0;j<ch.length;j++){
                if(!(ch[j]>='a'&&ch[j]<='z')) {upperChk=true;}
                else {upperChk=false; break;}
            }

            if(st.length()<=80&&upperChk==true){
                Scanner sc2=new Scanner(st).useDelimiter("\\s");
                int m=sc2.nextInt();
                st=sc2.next();
                if(m<=st.length()&&m!=0)
                    set.add(new Dataset(m,st)); 
            }

        }

    }

    for(int i=0;i<set.size();i++){
        d=set.get(i);
        String st1=d.st.substring(0,d.m-1);
        String st2=d.st.substring(d.m);
        System.out.println((i+1)+" "+d.st.substring(0, d.m-1)+d.st.substring(d.m));
    }

}

}

class Dataset{

int m=0;
String st="";

public Dataset(){}

public Dataset(int m,String st){
    this.m=m;
    this.st=st;
}

}