#include <stdio.h>

#define INF 2000000000

void set_segt (int *t, int idx, int val, int size) {
  idx = idx+size-1;
  t[idx] = val;
  
  while (idx > 0) {
    idx = (idx-1)/2;
    t[idx] = t[2*idx+1];
    if (t[2*idx+2] > t[2*idx+1]) {
      t[idx] = t[2*idx+2];
    }
  }
  
  return;
}

int max_segt_rec (int *t, int a, int b, int k, int l, int r) {
  int ans = 0;
  int tmp = 0;
  
  if (r <= a || b <= l) {
    return -INF;
  }
  
  if (a <= l && r <= b) {
    return t[k];
  }
  
  ans = max_segt_rec(t, a, b, 2*k+1, l, (l+r)/2);
  tmp = max_segt_rec(t, a, b, 2*k+2, (l+r)/2, r);
  
  if (ans < tmp) {
    ans = tmp;
  }
  
  return ans;
}

int max_segt (int *t, int a, int b, int size) {
  return max_segt_rec(t, a, b, 0, 0, size);
}

int bin_search_segt (int *t, int a, int b, int k, int size) {
  return -1;
}

int main () {
  char s[200001] = "";
  
  int res = 0;
  
  int len = 0;
  int z[200000] = {};
  
  int size = 1;
  int tz[600000] = {};
  int tm[600000] = {};
  
  int idx = 0;
  
  res = scanf("%s", s);
  while (s[len] != '\0') {
    len++;
  }
  
  while (size <= len) {
    size <<= 1;
  }
  
  for (int i = 0; i < len; i++) {
    set_segt(tm, i, -len, size);
  }
  
  printf("%d\n", (-1)*max_segt(tm, 0, len, size));
  return 0;
}