#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MASK(x) (1LL << (x))
#define BIT(x, i) (((x) >> (i)) & 1)
#define SZ(x) ((int) (x).size())
#define ALL(a) (a).begin(), (a).end()
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for (int i = (a); i >= (b); --i)
#define debug(x) cerr << "[" << #x << " = " << (x) << "]" << endl
#define left __left
#define right __right
#define prev __prev
#define fi first
#define se second
template <class X, class Y>
bool maximize(X &x, Y y) {
if (x < y) return x = y, true;
else return false;
}
template <class X, class Y>
bool minimize(X &x, Y y) {
if (x > y) return x = y, true;
else return false;
}
string s;
int main() {
ios_base::sync_with_stdio(false);cin.tie(nullptr);
cin >> s;
s += 'M';
set <int> se;
int ans = 0;
char last = 'A';
for (char c : s) {
if (c >= '0' && c <= '9') ans = ans * 10 + (c - '0');
else {
if (last >= '0' && last <= '9') se.insert(ans), ans = 0;
}
last = c;
}
cout << SZ(se);
return 0;
}
/* Discipline - Calm */
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