Car Names

Brian built his own car and was confused about what name he should keep for it. He asked Roman for help. Roman being his good friend, suggested a lot of names.
Brian only liked names that:
- Consisted of exactly three distinct characters, say C₁, C₂ and C₃
- Satisfied the criteria that the string was of the form - C₁ⁿ C₂ⁿ C₃ⁿ : This means, first C₁ occurs n times, then C₂ occurs n times and then C₃ occurs n times. For example, xyz, ccaarr, mmmiiiaaa satisfy the criteria, but xyzw, aabbbcccc don't.
Given N names suggested by Roman, print "OK" if Brian likes the name and "Not OK" if he doesn't.
Input:
First line contains a single positive integer N - the number of names.
N lines follow - each line contains a name.
Output:
For each name, Print "OK" if the name satisfies the criteria, else print "Not OK", on a new line.

Sample Input

2
bbbrrriii
brian

Sample Output

OK
Not OK

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;


class TestClass {
    public static void main(String args[] ) throws Exception 
{
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         String line = br.readLine();
         int N = Integer.parseInt(line);
         for (int i = 0; i < N; i++) 
        {
               String name=br.readLine();
              display(name);
        }
       
}
        public static void display(String s)
       {
List<Character> chArr = new ArrayList<Character>();
List<Integer> nubArr = new ArrayList<Integer>();
char prev = ' ';
int count = 0;
int loopCount = 0;
for(char c : s.toCharArray())
                  {
if (c !=  prev)
                          {
if (prev != ' ') 
                                {
chArr.add(prev);
nubArr.add(count);
}
prev = c;
count = 1;
}
                         else
                         {
count++;
}
loopCount++;
if (s.length() == loopCount)
                        {
if (c ==  prev)
                              {
chArr.add(prev);
nubArr.add(count);
}
                              else 
                              {
nubArr.set(nubArr.size()-1,count);
}

}
}
int size = chArr.size();
if (size == 3)  
                           {
int tem = 0;
boolean flag = true;
for(int c : nubArr)
                                       {
if (tem == 0)
                                             {
tem = c;
}
                                            else if ( tem  != c) 
                                            {
flag = false;
}

}

if (flag) 
                                        {
System.out.println("OK");
}
                                        else
                                         {
System.out.println("Not OK");
}
}
                                 else
                                 {
System.out.println("Not OK");
}
}
}