import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.util.ArrayList;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Jeel Vaishnav
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AConnectionAndDisconnection solver = new AConnectionAndDisconnection();
        solver.solve(1, in, out);
        out.close();
    }

    static class AConnectionAndDisconnection {
        public void solve(int testNumber, InputReader sc, PrintWriter out) {
            char[] s = sc.next().toCharArray();
            long k = sc.nextLong();

            ArrayList<Long> list = new ArrayList<>();
            int ind = 0;
            while (ind < s.length) {
                int j = ind;
                while (j < s.length && s[j] == s[ind])
                    j++;
                list.add((long) (j - ind));
                ind = j;
            }

            long ans = 0;
            for (int i = 1; i < list.size() - 1; ++i) {
                ans += list.get(i) / 2 * k;
            }

            if (list.size() == 1) {
                ans = (k * s.length) / 2;
            } else if (s[0] == s[s.length - 1]) {
                ans += list.get(0) / 2;
                ans += list.get(list.size() - 1) / 2;
                ans += (list.get(0) + list.get(list.size() - 1)) / 2 * (k - 1);
            } else {
                ans += list.get(0) / 2 * k;
                ans += list.get(list.size() - 1) / 2 * k;
            }
            out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new InputMismatchException();

            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }

                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public long nextLong() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;

            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
            return res * sgn;
        }

        public String readString() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            }
            while (!isSpaceChar(c));

            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public String next() {
            return readString();
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}



Measured memory_bytes: 32460