Large integer arithmetic, the input includes multiple sets of test cases with each case separated by a blank line between each use case within the composition by the three lines: the first two lines of each line contains a string that participate in operations of large integers, the input The length of the string does not exceed 100. The third line is the operator:+ or-. each use case within no blank lines.

bigint\bigint.cpp
......\bigint.h
......\readme.txt
......\..lease\bigint.exe
......\release
bigint

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