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terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::basic_string: __pos (which is 30) > this->size() (which is 0)

Your answer may be identical to the JOJ answer in the first several lines.

However, the main problem you meet now is Runtime Error. And the exit code of your program is -6, which should be 0.

Please double check your code to solve this problem and try again.

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