guess the number

import java.util.Scanner;
class Solution {
  public static void solve(Scanner input, int a, int b) {
    int m = (a + b) / 2;
    System.out.println(m);
    System.out.println("enter its \"TOO_SMALL or not or CORRECT\" guess ");
    String s = input.next();
    if (s.equals("CORRECT")) {
        System.out.println(m+" is the number ");
      return;
    } else if (s.equals("TOO_SMALL")) {
      solve(input, m + 1, b);
    } else {
      solve(input, a, m - 1);
    }
  }
 public static void main(String args[]) {
    Scanner input = new Scanner(System.in);
    System.out.println("Enter the number of test cases:");
    int T = input.nextInt();
    for (int ks = 1; ks <= T; ks++) {
      System.out.println("Enter the lower limt :");
      int a = input.nextInt();
      System.out.println("Enter the upper limt:");
      int b = input.nextInt();
      solve(input, a + 1, b);
    }
  }
}