POJ-1575(一直WA，但找不到原因)

#include<iostream>
#include<string>
using namespace std;

bool isVowel(char c){
	if(c=='a'||
	   c=='e'||
	   c=='i'||
	   c=='o'||
	   c=='u'){
		return true;
	}else{
		return false;
	}
}

bool rule(string s){
	bool containVowelFlag=false;
	int cntVowel=0;
	int cntConsonant=0;
	char lastC='1';

	for(int i=0;i<s.length();i++){
		if(isVowel(s[i])){
			cntConsonant=0;
			cntVowel++;
			if(cntVowel==3){
				return false;
			}
			containVowelFlag=true;
		}else{
			cntVowel=0;
			cntConsonant++;
			if(cntConsonant==3){
				return false;
			}
		}

		if(s[i]==lastC){
			if(lastC!='e'&&
			   lastC!='o'){
				return false;
			}
		}

		lastC=s[i];
	}

	if(!containVowelFlag){
		return false;
	}

	return true;
}

int main(int argc, char *argv[]){
	string s;
	while(cin>>s,s!="end"){
		if(rule(s)){
			cout<<"<"<<s<<"> is acceptable."<<endl;
		}else{
			cout<<"<"<<s<<"> is not acceptable"<<endl;
		}
	}
	return 0;
}