#include<bits/stdc++.h> using namespace std; int main(){ char str[10001]; cin>>str; int minn=-1,tmp,last=0; bool flag=false; for(int i=0;i<strlen(str);i++){ if(str[i]=='A'||str[i]=='E'||str[i]=='I'||str[i]=='O'||str[i]=='U'||'\0'){ flag=true; tmp=i-last; if(tmp>minn)minn=tmp; last=i; } if(str[i]=='\0')minn=max(minn,i-last); } if(flag)cout<<minn; else cout<<strlen(str)+1; return 0; }