public class Main {
    public static void main(String[] args) {
        String s = "h10jv2sf";

        char lastLetter = 0;
        boolean isDigit = false;
        int digit = 0;
        for(char c : s.toCharArray()) {
            if(Character.isDigit(c)) {
                isDigit = true;
                digit = digit*10 + (c-'0');
                continue;
            }
            if(isDigit) {
                for(int i = 0; i < digit-1; i++) {
                    System.out.print(lastLetter);
                }
                isDigit = false;
                digit = 0;
            }
            System.out.print(lastLetter);
            lastLetter = c;
        }
        System.out.print(lastLetter);
    }
}