foo.cc:6:1: error: 'Lint' does not name a type; did you mean 'uint'?
 Lint Mod(long long a, long long b, long long c)
 ^~~~
 uint
foo.cc: In function 'int main()':
foo.cc:17:50: error: 'Mod' was not declared in this scope
  cout << b << "^" << p << " mod " << k << "=" << Mod(b, p, k) << endl;
                                                  ^~~
foo.cc:17:50: note: suggested alternative: 'void'
  cout << b << "^" << p << " mod " << k << "=" << Mod(b, p, k) << endl;
                                                  ^~~
                                                  void

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