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#include <iostream> using namespace std; int rec(string s, int i) { if(i == -1) { return 0; } int cifra = 0; if(isdigit(s[i])) { cifra = (s[i] - '0'); return rec(s, i - 1) * 10 + cifra; } else { return rec(s, i - 1); } } int main() { string s; cin >> s; cout << rec(s, s.size() - 1) << endl; return 0; } /* rec(123abc45, 7) = rec(123abc45, 6) * 10 + 5 = 1234 * 10 + 5 = 12345 rec(123abc45, 6) = rec(123abc45, 5) * 10 + 4 = 123 * 10 + 4 = 1234 rec(123abc45, 5) = rec(123abc45, 4) = 123 rec(123abc45, 4) = rec(123abc45, 3) = 123 rec(123abc45, 3) = rec(123abc45, 2) = 123 rec(123abc45, 2) = rec(123abc45, 1) * 10 + 3 = 12 * 10 + 3 = 123 rec(123abc45, 1) = rec(123abc45, 0) * 10 + 2 = 1 * 10 + 2 = 12 rec(123abc45, 0) = rec(123abc45, -1) * 10 + 1 = 0 * 10 + 1 = 1 rec(123abc45, -1) = 0 **/
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