import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.FilterInputStream;
import java.io.BufferedInputStream;
import java.io.InputStream;

/**
 * @author khokharnikunj8
 */

public class Main {
    public static void main(String[] args) {
        new Thread(null, new Runnable() {
            public void run() {
                new Main().solve();
            }
        }, "1", 1 << 26).start();
    }

    void solve() {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        ScanReader in = new ScanReader(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, ScanReader in, PrintWriter out) {
            char[] ar = in.scanString().toCharArray();
            long k = in.scanInt();
            long ans = 0;
            boolean flagg = true;
            for (int i = 0; i < ar.length; i++) {
                if (ar[i] != ar[0]) {
                    flagg = false;
                }
            }
            if (flagg) {
                out.println((ar.length * k) / 2);
                return;
            }
            for (int i = 0; i < ar.length; ) {
                int temp = i;
                boolean flag = false;
                while (ar[i] == ar[temp]) {
                    temp++;
                    if (temp >= ar.length) {
                        flag = true;
                        break;
                    }
                }
                if (flag) {
                    temp = 0;
                    while (ar[temp] == ar[i]) temp++;
                    ans += ((ar.length - i + temp) / 2) * (k - 1);
                    ans += (ar.length - i) / 2;
                    ans -= ((k - 1) * (temp / 2));
                    break;
                } else {
                    ans += ((temp - i) / 2) * k;
                    i = temp;
                }
            }
            out.println(ans);
        }

    }

    static class ScanReader {
        private byte[] buf = new byte[4 * 1024];
        private int index;
        private BufferedInputStream in;
        private int total;

        public ScanReader(InputStream inputStream) {
            in = new BufferedInputStream(inputStream);
        }

        private int scan() {
            if (index >= total) {
                index = 0;
                try {
                    total = in.read(buf);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                if (total <= 0) return -1;
            }
            return buf[index++];
        }

        public int scanInt() {
            int integer = 0;
            int n = scan();
            while (isWhiteSpace(n)) n = scan();
            int neg = 1;
            if (n == '-') {
                neg = -1;
                n = scan();
            }
            while (!isWhiteSpace(n)) {
                if (n >= '0' && n <= '9') {
                    integer *= 10;
                    integer += n - '0';
                    n = scan();
                }
            }
            return neg * integer;
        }

        public String scanString() {
            int c = scan();
            if (c == -1) return null;
            while (isWhiteSpace(c)) c = scan();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = scan();
            } while (!isWhiteSpace(c));
            return res.toString();
        }

        private boolean isWhiteSpace(int n) {
            if (n == ' ' || n == '\n' || n == '\r' || n == '\t' || n == -1) return true;
            else return false;
        }

    }
}



Measured memory_bytes: 23380