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public class Programmiertest3 {
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    private static int nDigits(int n) {
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        int count = 0;
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        while(n > 0) {
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            n /= 10;
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            count++;
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        }
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        return count;
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    }
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    private static int mSDigit(int n) {
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        int digitNumber = nDigits(n);
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        int max = 0;
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        for (int i = 0; i < digitNumber; i++) {
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            max = max > (n % 10) ? max : n % 10;
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            n /= 10;
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        }
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        return max;
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    }
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    private static String substringA(String s) {
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        if(s.length() <= 1) {
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            return s;
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        }
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        String temp = substringA(s.substring(1));
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        if (temp.charAt(0) == 'A') {
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            return temp;
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        }
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        return s;
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    }
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    public static void main(String[] args) {
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        String text1 = "Just AA Test!";
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        String text2 = "Servus!";
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        System.out.println(nDigits(70123));
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        System.out.println(mSDigit(70123));
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        System.out.println(nDigits(5));
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        System.out.println(mSDigit(5));
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        System.out.println(substringA(text1));
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        System.out.println(substringA(text1 + text1));
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        System.out.println(substringA(text2));
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        System.out.println(substringA(text1 + text2));
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    }
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}
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