Anonymous_Vox

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace Exercise
{
    class Program
    {
        static void Main(string[] args)
        {
            var placeholder = Console.ReadLine();
            var regPlace = @"([A-Za-z]+)(.+)\1";
            var value = Console.ReadLine();
            var regValue = @"({)(.*?)(})";
            //
            MatchCollection placeholderCollection = Regex.Matches(placeholder,regPlace);
            MatchCollection valueCollection = Regex.Matches(value, regValue);
            //

            for (int i = 0; i < Math.Min(placeholderCollection.Count, valueCollection.Count); i++)
            {
                string toChange = placeholderCollection[i].Groups[2].Value;
                string toPut = valueCollection[i].Groups[2].Value;
                int index = placeholder.IndexOf(toChange);
                placeholder = placeholder.Remove(index, toChange.Count());
                placeholder = placeholder.Insert(index, toPut);
            }
            Console.WriteLine(placeholder);

        }
    }
}