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#include<iostream> #include<string> using namespace std; main() string s="GCV"; int i,n; char c; cin>>s; if(s.size()!=5||s[2]!='-'|| s[0]<'A'||s[0]>'H'|| s[3]<'A'||s[3]>'H'|| s[1]<'1'||s[1]>'8'|| s[4]<'1'||s[4]>'8')cout<<"ERROR"; else if(abs((s[0]-s[3])*(s[1]-s[4]))==2)cout<<"YES"; else cout<<"NO";
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