using System;

​

namespace Calculator

{

    class Program

    {

        static void Main(string args)

        {

            string firstOperand = Console.ReadLine();

            char operation = char.Parse(Console.ReadLine());

            string secondOperand = Console.ReadLine();

​

            if (operation == '+')

            {

                string result = Sum(firstOperand, secondOperand);

                Console.WriteLine(result);

            }

            else if (operation == '-')

            {

                string result = Subtract(firstOperand, secondOperand);

                Console.WriteLine(result);

            }

        }

​

        static string Sum(string num1, string num2)

        {

            int maxLength = Math.Max(num1.Length, num2.Length);

            num1 = num1.PadLeft(maxLength, '0');

            num2 = num2.PadLeft(maxLength, '0');

​

            int carry = 0;

            string result = string.Empty;

​

            for (int i = maxLength - 1; i >= 0; i--)

            {

                int digit1 = num1i - '0';

                int digit2 = num2i - '0';

​

                int sum = digit1 + digit2 + carry;

                carry = sum / 10;

                sum = sum % 10;

​

                result = sum + result;

            }

​

            if (carry > 0)

            {

                result = carry + result;

            }

​

            return result.TrimStart('0');

        }

​

        static string Subtract(string num1, string num2)

        {

            if (IsSmaller(num1, num2))

            {

                string temp = num1;

                num1 = num2;

                num2 = temp;

            }

​

            string result = string.Empty;

​

            int maxLength = Math.Max(num1.Length, num2.Length);

            num1 = num1.PadLeft(maxLength, '0');

            num2 = num2.PadLeft(maxLength, '0');

​

            int carry = 0;

​

            for (int i = maxLength - 1; i >= 0; i--)

            {

                int digit1 = num1i - '0';

                int digit2 = num2i - '0';

​

                int sub = digit1 - digit2 - carry;

​

                if (sub < 0)

                {

                    sub = sub + 10;

                    carry = 1;

                }

                else

                {

                    carry = 0;

                }

​

                result = sub + result;

            }

​

            return result.TrimStart('0');

        }

​

        static bool IsSmaller(string str1, string str2)

        {

            int length1 = str1.Length;

            int length2 = str2.Length;

​

            if (length1 < length2)

            {

                return true;

            }

            if (length2 < length1)

            {

                return false;

            }

​

            for (int i = 0; i < length1; i++)

            {

                if (str1i < str2i)

                {

                    return true;

                }

                else if (str1i > str2i)

                {

                    return false;

                }

            }

​

            return false;

        }

    }

}