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#include <string>
#include <vector>

using namespace std;

int CharToInt(char cTimeChar);
int StringTimeToIntSec(string stringTime);
string IntSecToStringTime(int second);

string solution(string video_len, string pos, string op_start, string op_end, vector<string> commands) {
    string answer = "";

    int videoLen = StringTimeToIntSec(video_len);
    int currentPos = StringTimeToIntSec(pos);
    int opStartPos = StringTimeToIntSec(op_start);
    int opEndPos = StringTimeToIntSec(op_end);

    for (auto command : commands)
    {
        if (opStartPos <= currentPos && currentPos <= opEndPos)
        {
            currentPos = opEndPos;
        }

        if (command == "next")
        {
            bool bCheck = false;

            if (opStartPos <= currentPos + 10 && currentPos <= opEndPos)
            {
                if(opEndPos - currentPos > 10)
                {
                    bCheck = true;
                }

                currentPos = opEndPos;
            }

            if(!bCheck)
            {
                currentPos += 10;   
            }
        }
        else if (command == "prev")
        {
            currentPos -= 10; 
        }

        if (currentPos < 0)
        {
            currentPos = 0;
        }

        if (currentPos > videoLen-10)
        {
            currentPos = videoLen;
        }
    }    

    return IntSecToStringTime(currentPos);
}

int CharToInt(char cTimeChar)
{
    return cTimeChar - '0';
}

int StringTimeToIntSec(string stringTime)
{
    return ((CharToInt(stringTime[0]) * 10 + CharToInt(stringTime[1])) * 60) + (CharToInt(stringTime[3]) * 10 + CharToInt(stringTime[4]));
}

string IntSecToStringTime(int second)
{
    int iMinute = second / 60;
    char cFirstChar = iMinute / 10 + '0';
    char cSecondChar = iMinute % 10 + '0';

    int iSecond = second % 60;
    char cThirdChar = iSecond / 10 + '0';
    char cFourthChar = iSecond % 10 + '0';

    char tempArray[5 + 1];
    //memset(tempArray, 0x00, 5 + 1);

    tempArray[0] = cFirstChar;
    tempArray[1] = cSecondChar;
    tempArray[2] = ':';
    tempArray[3] = cThirdChar;
    tempArray[4] = cFourthChar;

    tempArray[5] = 0x00;

    return string(tempArray);
}