#include <iostream> using namespace std; int delnum(char *s) { int i, j; j = 0; for (i = 0; s[i] != '\0'; i++) if (s[i] < '0' 1 s[i] > '9') { s[j] = s[i]; 2 ; } return 3 ; } const int SIZE = 30; int main(void) { char s[SIZE]; int len, i; cin.getline(s, sizeof(s)); len = delnum(s); for (i = 0; i < len; i++) cout <<4; cout << endl; return 0; }