#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
using ll = long long;
using ld = long double;
#define all(x) x.begin(),x.end()
#define v(x) vector<x>
#define nl '\n'
#define fxd(x) fixed << setprecision(x)
template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;
int main()
{
ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
string s; cin >> s;
int maxlen = 0 , lencounter = 0;
for (int i = 0; i < s.length(); i++)
{
if(s[i] == 'A' || s[i] == 'C' ||s[i] == 'G' ||s[i] == 'T')
{
lencounter++;
}
else
{
if(lencounter > maxlen)
{
maxlen = lencounter;
}
lencounter = 0;
}
}
cout << max(maxlen,lencounter);
}
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