#include <iostream>
#include <string>
 
int main()
 
{
    std::string str = "asdfgsdfg:ijtij ijdfgh ija::saf 1999 bp";
    int start = str.find(":");
    int end = str.length() - 2; // Changed here
    std::string substring;
    if (start != std::string::npos && end != std::string::npos)
    {
       substring = str.substr(start + 1, end - start - 1);
    }
    else
    {
       // Whatever you want to do if the markers are missing.
    }
    std::cout << substring;
}

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