public class Demo5 {

        public static void main(String[] args) {
                char[] t = {'t','i','i','s','t','a','i','t','a','i','k','a'};

                int kerrat = x(t);
                System.out.println(kerrat);
        }

        public static int x(char[] merkit) {
                int lkm = 0;
                int i = 0;
                while (i <= (merkit.length - 2)) {
                        if (merkit[i] == 'a' & 'i' == merkit[i+1])
                                lkm = lkm + 1;
                        i = i + 1;
                }
                return lkm;
        }
}