View Compilation Error

0_0_35300733_15652.cpp: In function 'int main()':
0_0_35300733_15652.cpp:36:70: error: invalid operands of types 'const char [7]' and 'const char [3]' to binary 'operator<<'
                 cout<<"Sheet "<<(i+1)/2<<i%2?(", front"):(", back")<<": ";
                                                                      ^