#include<bits/stdc++.h> using namespace std; #define int long long signed main(){ int n; string a; cin>>n>>a; int tt=0; for(int i=0;i<=n-3;i++){ if(a[i]=='A'&&a[i+1]=='B'&&a[i+2]=='C'){ tt++; } } cout<<tt; }
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