不难

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a=0,c=0;
	string s;
    getline(cin,s);
    for(int i=0;i<s.size();i++){
        if(s[i]=='A'&&s[i+1]=='C'){
            a++;
        }else if((s[i]=='A'&&s[i+1]=='A'&&s[i+2]!='C')||(s[i]=='C'&&s[i+1]=='C'&&s[i-1]!='A')){
            c=1;
        }
    }
    cout<<a+c;
	return 0;
}