0_0_2257500_27236.cpp:3: error: `main' must return `int'
0_0_2257500_27236.cpp: In function `int main(...)':
0_0_2257500_27236.cpp:7: error: `a' undeclared (first use this function)
0_0_2257500_27236.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
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