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#include <bits/stdc++.h>
using namespace std;
const int N = 110;
/*
https://leetcode.cn/problems/strange-printer/
输入：s = "aaabbb"
输出：2
解释：首先打印 "aaa" 然后打印 "bbb"。
示例 2：
输入：s = "aba"
解释：首先打印 "aaa" 然后在第二个位置打印 "b" 覆盖掉原来的字符 'a'。
*/
int f[N][N];
int main() {
string s;
cin >> s;
int n = s.size();
memset(f, 0x3f, sizeof f);
for (int i = n - 1; i >= 0; i--) {
f[i][i] = 1;
for (int j = i + 1; j < n; j++) {
if (s[i] == s[j])
f[i][j] = f[i][j - 1];
else {
for (int k = i; k < j; k++)
f[i][j] = min(f[i][j], f[i][k] + f[k + 1][j]);
}
cout << f[0][n - 1] << endl;
return 0;
