1039 Easier Done Than Said?

#include<iostream>using namespace std;bool first(string str);bool second(string str);bool third(string str);int main(void){    string str;    while(cin>>str)    {        if(str=="end")        {            break;        }        if(!first(str)||!second(str)||!third(str))        {            cout<<'<'<<str<<'>'<<" is not acceptable."<<endl;        }        else        {            cout<<'<'<<str<<'>'<<" is acceptable."<<endl;        }    }    return 0;}bool isVowel(char ch){    return ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u';}bool first(string str){    for(int i=0;i<str.length();i++)    {        if(str[i]=='a'||str[i]=='e'||str[i]=='i'||str[i]=='o'||str[i]=='u')        {            return true;        }    }    return false;}bool second(string str){    for(int i=0;i<str.length();i++)    {        if((i+2)<str.length()&&isVowel(str[i])&&isVowel(str[i+1])&&isVowel(str[i+2]))        {            return false;        }        else if((i+2)<str.length()&&!isVowel(str[i])&&!isVowel(str[i+1])&&!isVowel(str[i+2]))        {            return false;        }    }    return true;}bool third(string str){    for(int i=0;i<str.length();i++)    {        if((i+1)<str.length()&&str[i]==str[i+1]&&str[i]!='e'&&str[i]!='o')        {            return false;        }    }    return true;}