02.09.04.01.BasicLanguage

using System;
using System.Collections.Generic;
using System.Text;

class BasicLanguage
{
    static List<int> AddIndexes(string target)
    {
        int index = -1;
        List<int> currentList = new List<int>();
        while (true)
        {
            index = allText.IndexOf(target, index + 1);
            if (index == -1)
            {
                break;
            }
            else
            {
                currentList.Add(index);
            }
        }
        return currentList;
    }

    static string allText;

    static void Main()
    {
        StringBuilder sb = new StringBuilder();

        while (true)
        {
            string currentLine = Console.ReadLine();
            int indexOfExit = currentLine.IndexOf("EXIT;");
            if (indexOfExit == -1)
            {
                sb.Append(currentLine);
                sb.AppendLine();
            }
            else
            {
                sb.Append(currentLine);
                break;
            }
        }

        allText = sb.ToString();
        List<int> printList = AddIndexes("PRINT");
        List<int> forList = AddIndexes("FOR");
        List<int> endList = AddIndexes("EXIT;");

        //int max = (Math.Max(printList.Count, forList.Count));
        int i = 0;
        int j = 0;
        long printTimes = 1;
        while (true)
        {
            int currentPrintIndex = 200000; // out of the input bonds
            if (i < printList.Count)
            {
                currentPrintIndex = printList[i];
            }

            int currentForIndex = 200000;
            if (j < forList.Count)
            {
                currentForIndex = forList[j];
            }

            if (currentPrintIndex > endList[0] && currentForIndex > endList[0])
            {
                break;
            }
            else if (currentPrintIndex < currentForIndex)
            {
                Print(currentPrintIndex, printTimes);
                i++;
                printTimes = 1;
                continue;
            }
            else
            {
                printTimes = ForLoop(currentForIndex, printTimes);
                j++;
                continue;
            }

        }
    }

    static void Print(int currentIndex, long printTimes)
    {
        int start = currentIndex + 5;
        string textLeft = allText.Substring(start, allText.Length - start);
        int indexOpen = textLeft.IndexOf("(");
        int indexClose = textLeft.IndexOf(")");

        int startOutput = currentIndex + 5 + indexOpen + 1;
        int stringLength = indexClose - indexOpen - 1;

        string currentOutput = allText.Substring(startOutput, stringLength);
        for (long i = 1; i <= printTimes; i++)
        {
            Console.Write(currentOutput);
        }
    }

    static long ForLoop(int currentIndex, long printTimes)
    {
        int start = currentIndex + 3;
        string textLeft = allText.Substring(start, allText.Length - start);
        int indexOpen = textLeft.IndexOf("(");
        int indexClose = textLeft.IndexOf(")");

        int startOutput = currentIndex + 3 + indexOpen + 1;
        int stringLength = indexClose - indexOpen - 1;

        string currentLoop = allText.Substring(startOutput, stringLength);

        int commaIndex = currentLoop.IndexOf(",");
        if (commaIndex == -1)
        {
            int number = int.Parse(currentLoop.Trim());
            printTimes = printTimes * number;
        }
        else
        {
            string a = currentLoop.Substring(0, commaIndex);
            string b = currentLoop.Substring(commaIndex + 1, currentLoop.Length - commaIndex - 1);
            int numberA = int.Parse(a.Trim());
            int numberB = int.Parse(b.Trim());
            int number = numberB - numberA + 1;
            printTimes = printTimes * number;
        }
        return printTimes;
    }
}