为什么最后 ans 要 -1

#include<bits/stdc++.h>
using namespace std;
int main() 
{	
	char x[233];
	int i,ans=0;
	cin.getline(x,233);
	for(i=0;i<strlen(x);i++)
	{
		if(x[i]=='a'||x[i]=='d'||x[i]=='g'||x[i]=='j'||x[i]=='m'||x[i]=='p'||x[i]=='t'||x[i]=='w')
			ans++;
		else if(x[i]=='b'||x[i]=='e'||x[i]=='h'||x[i]=='k'||x[i]=='n'||x[i]=='q'||x[i]=='u'||x[i]=='x')
			ans+=2;
		else if(x[i]=='c'||x[i]=='f'||x[i]=='i'||x[i]=='l'||x[i]=='o'||x[i]=='r'||x[i]=='v'||x[i]=='y')
			ans+=3;
		else if(x[i]=='s'||x[i]=='z')
			ans+=4;
		else
			ans++;
	}
	cout<<ans-1;//不-1全WA
	return 0;
}