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#include<iostream>
using namespace std;
string str;
bool check(char c)
{
if(c=='a' || c=='o' || c=='u' || c=='i' || c=='e')
return true;
else
return false;
}
int main()
{
cin>>str;
for(int i=0;i<str.size();i++)
{
if(str[i]=='n')
continue;
else if(check(str[i]))
continue;
else if(!check(str[i+1]))
{
cout<<"NO"<<endl;
return 0;
}
}
cout<<"YES"<<endl;
return 0;
}
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