0_0_4834892_21607.cpp: In function `int main()':
0_0_4834892_21607.cpp:14: error: `A' undeclared (first use this function)
0_0_4834892_21607.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4834892_21607.cpp:14: error: expected `;' before '}' token
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