#include <bits/stdc++.h>
#define ll long long
#define endl "\n"
#define Arr_MAX 1000005
using namespace std;
int main()
{
freopen("BAI4.inp","r",stdin);
freopen("BAI4.out","w",stdout);
ll n;
char a[Arr_MAX];
for (ll i=1;i<=n;i++)
cin>>a[i];
ll ans=0,MAX=-1;
for (ll i=1;i<=n;i++)
{
if (a[i]=='a' || a[i]=='i'|| a[i]=='o'|| a[i]=='e' || a[i]=='u')
{
ans++;
MAX=(max(MAX,ans));
}
else
ans=0;
}
cout<<MAX;
return 0;
}
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