#include <bits/stdc++.h>
using namespace std;
long long const mod = 1000000007LL;
long long const md = 998244353LL;
long long mypowr(long long a, long long b) {
  long long res = 1;
  if (b < 0) b = 0;
  a %= mod;
  assert(b >= 0);
  for (; b; b >>= 1) {
    if (b & 1) res = res * a % mod;
    a = a * a % mod;
  }
  return res;
}
long long mypow(long long a, long long b) {
  long long res = 1;
  if (b < 0) b = 0;
  assert(b >= 0);
  for (; b; b >>= 1) {
    if (b & 1) res = res * a;
    a = a * a;
  }
  return res;
}
ifstream in("input.txt");
ofstream out("output.txt");
const long long maxn = 1e5 + 5;
int a[maxn], b[maxn];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cout << fixed << setprecision(15);
  int tt = 1;
  while (tt--) {
    string s;
    cin >> s;
    int n = s.size();
    s += s;
    long long cnt = 0;
    long long sum = 1;
    for (int i = 1; i < 2 * n; ++i) {
      if (s[i] != s[i - 1])
        ++sum;
      else {
        cnt = max(cnt, sum);
        sum = 1;
      }
    }
    cnt = max(cnt, sum);
    if (cnt > n) cnt = n;
    cout << cnt << '\n';
  }
  return 0;
}
