my solution

src/main/java/Solution.java

@@ -1,6 +1,4 @@
 import java.util.*;
-import java.io.*;
-import java.math.*;
 
 /**
  * Template code to help you parse the standard input 
@@ -11,10 +9,34 @@ class Solution {
 	public static void main( String[] args ) {
 		Scanner in = new Scanner( System.in );
 		// read values with in.next...() methods
-		
+		String input = in.nextLine();
 		// code your solution here
-		
+		boolean output = isInputWellFormed(input);
 		// Write result with System.out.println()
-		System.out.println( "value" );
+		System.out.println( output );
+	}
+
+	private static boolean isInputWellFormed(String input) {
+		HashMap<Character, Character> validPairs = new HashMap<>();
+		validPairs.put('{', '}');
+		validPairs.put('(', ')');
+		validPairs.put('[', ']');
+
+		Deque<Character> unmatchedChars = new ArrayDeque<>();
+
+		for (int i = 0; i < input.length(); i++) {
+			char currentChar = input.charAt(i);
+
+			if (validPairs.keySet().contains(currentChar)) {
+				unmatchedChars.push(currentChar); // Add only opening ({[ to the unmatchedChars.
+			} else if (validPairs.values().contains(currentChar)) {
+				if (!unmatchedChars.isEmpty() && validPairs.get(unmatchedChars.peekFirst()) == currentChar) {
+					unmatchedChars.pop(); // Match found, empty the unmatchedChars.
+				} else {
+					return false;
+				}
+			}
+		}
+		return unmatchedChars.isEmpty();
 	}
 }