The basic idea: We use a variable ~Amin~ to count accented tones that are main tones in A-minor, and a variable ~Cmaj~ to count accented tones that are main tones in C-major.

Implementation details: One traversal (using a for-loop) over the input string is used to find accented tones in the following way: a tone is accented if it is the first character in the string, or if the previous character was |. For each accented tone, we can use a branching statement (such as if-then-else or switch-case) to check whether it is equal to C, F, or G (in which case we increment the variable ~Cmaj~), or to A, D, or E (in which case we increment the variable ~Amin~).

Finally, it is obvious what we need to output if ~Amin < Cmaj~ or if ~Amin > Cmaj~. If, on the other hand, ~Amin = Cmaj~, we simply need to check whether the last character of the input string is A or C, as defined in the problem statement.