0_0_7318927_5252.cpp: In function `int main()':
0_0_7318927_5252.cpp:4: error: `unsign' undeclared (first use this function)
0_0_7318927_5252.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7318927_5252.cpp:4: error: expected `;' before "int"
0_0_7318927_5252.cpp:5: error: `a' undeclared (first use this function)
0_0_7318927_5252.cpp:7: error: `sum' undeclared (first use this function)
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