#include using namespace std; #ifdef DEBUGMODE #define dump(x) cerr << #x << " = " << (x) << "\n" #define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << "\n" #endif #ifndef DEBUGMODE #define dump(x) #define debug(x) #endif #define FOR(i, s, n) for(int i = s; i < (int)n; ++i) #define per(i, n) for(int i = n; i >= 0; i--) #define ROF(i, s, n) for(int i = s; i >= (int)n; i--) #define FORIT(i, A) for (auto i : A) #define PRINT(x) cout << (x) << "\n" #define ALL(a) (a).begin(),(a).end() #define RALL(a) (a).rbegin(), (a).rend() #define MP make_pair #define PB push_back #define EACH(i, n) for (__typeof((n).begin()) i = (n).begin(); i != (n).end(); ++i) #define SZ(a) int((a).size()) #define EXIST(s,e) ((s).find(e)!=(s).end()) #define SORT(c) sort((c).begin(),(c).end()) #define CLR(a) memset((a), 0 ,sizeof(a)) #define NCLR(a) memset((a), -1 ,sizeof(a)) typedef vector VI; typedef vector VVI; typedef vector VS; typedef pair PII; typedef long long LL; typedef vector VLL; typedef vector VVLL; typedef unsigned int uint; typedef unsigned long long ull; typedef priority_queue maxpq; typedef priority_queue< int, vector, greater > minpq; typedef complex Point; static const double EPS = 1e-10; static const double PI = acos( -1.0 ); static const int mod = 1000000007; static const int INF = 1 << 29; static const LL LL_INF = 1ll << 60; static const int dx[] = { -1, 0, 1, 0, 1, -1, 1, -1 }; static const int dy[] = { 0, -1, 0, 1, 1, 1, -1, -1 }; int main(){ cin.tie(0); ios::sync_with_stdio(0); string s; cin >> s; int ans = 0; for(int i = 0; i < s.size(); i++){ if(0 <= s[i] - '0' && s[i] - '0' <= 9) ans += s[i] - '0'; } cout << ans << "\n"; }