#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;
cin>>s;
int i,k,cnt,max;
k=s.length();
cnt=0;
max=0;
for(i=0;i<k;i++)
{
if(s[i]=='a'||s[i]=='e'||s[i]=='e'||s[i]=='o'||s[i]=='u')
cnt++;
else
{
if(max<cnt)
max=cnt;
cnt=0;
}
}
cout<<max<<endl;
return 0;
}
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