What's wrong with it ?
package com.codegym.task.task08.task0812;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.*;
/*
Longest sequence
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 0;i< 10; i++) {
list.add(Integer.parseInt(reader.readLine()));
}
int sequence = 0;
for (int i = 0; i < list.size()-1; i++) {
if (list.get(i) == list.get(i+1)) {
sequence+=1;
}
}
System.out.println(sequence);
}
}