using System;

public class Program

{

​

    public void Main()

    {

        TestRunner("{}", true);

        TestRunner("}{", false);

        TestRunner("{{}", false);

        TestRunner("", true);

        TestRunner("{abc...xyz}", true);

    }

    public bool AreAllBracketsMatched(string str){

        int unpairedLeftBrackets = 0;

        foreach(char c in str){

        if(c == '{'){

        unpairedLeftBrackets++;

        }

        else if(c == '}'){

            if(unpairedLeftBrackets == 0)return false;

            unpairedLeftBrackets--;

            }

        }

        return unpairedLeftBrackets == 0;

    }

    public void TestRunner(string inputString, bool expectedResult)

    {

        bool isValidBracket = AreAllBracketsMatched(inputString);

        bool doesActualEqualExpected = isValidBracket == expectedResult;

        Console.WriteLine("Input String: " + inputString + ", Does Expected Value Match Actual: " + doesActualEqualExpected);

    }

}