using System;
using System.Text.RegularExpressions;
 
class Program
{
    static void Main()
    {
	// This is the input string we are replacing parts from.
	string input = "select id, :DATA_INI, ':DATA_INI', titulo, date_format(data_criacao,'%d/%m/%Y %H:%i') str_data_criacao\n"
            + "from v$sugestoes\n"
            + "where data_criacao between :DATA_INI AND :DATA_FIM AND ':TEST'\n"
            + "  and  'test ''string :DATA_INI '' :DATA_INI '\n"
            + "order by data_criacao";
 
	string output = Regex.Replace(input, ":(?=([^']*'[^']*')*[^']*$)", "@");
 
	Console.WriteLine(output);
    }
}

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