KNIGHTMV:WA

general
,
1

The problem link is correctness of knight move.
I have the following code and can’t find where i am going wrong.Any help would be appreciated.

#include <iostream>
using namespace std;

int valid(string s)
{
if(s.length()!=5)
return 0;
if(s[0]<97 || s[0]>104 || s[3]<97 || s[1]>104)
return 0;
if(s[1]<49 || s[1]>56 || s[4]<49 || s[4]>56)
return 0;
if(s[2]!='-')
return 0;
return 1;
}
int main()
{
int t;
string s;
cin>>t;
cin.ignore();
	//ignoore a \n
while(t--)
{
    getline(cin,s);
	if(valid(s)==0)
	{
		cout<<"Error"<<endl;
		continue;
	}
	if((abs(s[0]-s[3])==2 && abs(s[1]-s[4])==1) || (abs(s[0]-s[3])==1 && abs(s[1]-s[4])==2))
	cout<<"Yes"<<endl;
	else
	cout<<"No"<<endl;
}
return 0;
}