public class Retezce
{
    public static int pocetvelkych(String ret)
    {
        int pocet = 0;
        for(int i=0; i<ret.length(); i++)
        {
            if(Character.isUpperCase(ret.charAt(i)))
            pocet++;
        }
        return pocet;
    }
    
    public static int pocetmalych(String ret)
    {
        int pocet = 0;
        for(int i=0; i<ret.length(); i++)
        {
            if(Character.isLowerCase(ret.charAt(i)))
            pocet++;
        }
        return pocet;
    }
    
    public static String otoc(String ret)
    {
        String pom = "";
        for(int i=1; i<=ret.length(); i++)
        {
            pom += ret.charAt(ret.length()-i);
        }
        return pom;
    }
    
    public static int ciferny_soucet(int cislo)
    {
        String cis = Integer.toString(cislo);
        int soucet = 0;
        for(int i=0; i<cis.length(); i++)
        {
            soucet += Character.getNumericValue(cis.charAt(i));
        }
        return soucet;
    }
    
    public static int pocet_samohlasek(String ret)
    {
        int pocet = 0;
        String souhl = "aeiouy";
        String retm = ret.toLowerCase();
        
        for(int i=0; i<souhl.length(); i++)
        {
            for(int j=0; j<ret.length(); j++)
            {
                if(souhl.charAt(i) == retm.charAt(j))
                pocet++;
            }
        }
        return pocet;
    }
    
    public static int exponent(int x, int n)
    {
        int v = 1;
        int i = 0;
        
        if(n == 0)
        {
            v = 1;
        }
            else
            {
                while(i!=n)
                {
                    v = v*x;
                    i++;
                }
            }
        return v;
    }
}