SPOJ 8395 C# No Sign of error but WA is what i get

This is problem 8395. ZBROJ it´s getting me wrong answer and i watched out every detailed except the output form, the problem is little specific about what should i print, i guess that´s my error. Anyway if you find any error in it please do tell me so i can finally get this.

Thank you for your time.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            string[] s = Console.ReadLine().Split(' ');
            long a = Convert.ToInt64(s[0]); // entero a
            long b = Convert.ToInt64(s[1]); // entero b    
            char[] a1= new char [s[0].Length]; //arreglo 2da a
            int c=0,d=0; // contadores de caracteres
            char[] b1= new char [s[1].Length]; //arreglo 2da b
            string x=" "; // segundos a en casos de 5 y 6
            string y = " "; //segunda b en caso 5 y 6
            long suma1= a + b;
            long suma2;
            if (digitos5y6(a) || digitos5y6(b))
        {
        
            foreach (char i in s[0])
            {
                if (i == '5') a1[c++] = '6';
                else
                {
                    if (i == '6') a1[c++] = '5';
                    else a1[c++] = i;
                }
            }

            foreach (char j in s[1])
            {
                if (j == '5') b1[d++] = '6';
                else
                {
                    if (j == '6') b1[d++] = '5';
                    else b1[d++] = j;
                }
            }

            for (int k = 0; k < a1.Length; k++)
            {
                x += a1[k];
            }

            for (int k = 0; k < b1.Length; k++)
            {
                y += b1[k];
            }

            suma2 = Convert.ToInt64(x.Trim()) + Convert.ToInt64(y.Trim());

            if (suma1 < suma2)
            {
                string result1 = Convert.ToString(suma1);
                string result2 = Convert.ToString(suma2);
                Console.WriteLine(result1 + ' ' + result2);
            }
            else
            {
                string result1 = Convert.ToString(suma2);
                string result2 = Convert.ToString(suma1);
                Console.WriteLine(result1 + ' ' + result2);
            }
        }

        if (!digitos5y6(a) && !digitos5y6(b)) Console.WriteLine(suma1);
        Console.Read();
    }

    static bool digitos5y6(long n)
    {
        //revisa si el numero tiene digitos de 5 o 6

        bool dig = false; // si tiene dig de 5 o 6 asume no
        long r; //residuo actual del ciclo

        while (n > 0)
        {
            r = n % 10;
            if (r == 5 || r == 6) dig = true;
            n = n / 10;
        }

        return dig;

    }
}
}