#include <iostream>
#include <string>
#include <vector>
#include <numeric>
#include <queue>
#include <unordered_map>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <sstream>
#include <stack>
#include <map>
#include <set>
#include <ios>
#include <cctype>
#include <cstdio>
#include <functional>
#include <cassert>
#include <fstream>
#include <ctime>

using namespace std;
using ll = long long;

#define REP(i,a) for(int i = 0;i < (a);++i)
#define FOR(i,a,b) for(int i = (a);i < (b); ++i)
#define FORR(i,a,b) for(int i = (a) - 1;i >=(b);--i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SIZE(obj) (int)(obj).sizeT()
#define YESNO(cond,yes,no){cout <<((cond)?(yes):(no))<<endl; }
#define SORT(list) sort(ALL((list)));
#define RSORT(list) sort((list).rbegin(),(list).rend())
#define ASSERT(cond,mes) assert(cond && mes)

constexpr int MOD = 1'000'000'007;
constexpr int INF = 1'050'000'000;

template<typename T>
T round_up(const T& a, const T& b) {
    return (a + (b - 1)) / b;
}

template <typename T1, typename T2>
istream& operator>>(istream& is, pair<T1, T2>& p) {
    is >> p.first >> p.second;
    return is;
}

template <typename T1, typename T2>
ostream& operator<<(ostream& os, pair<T1, T2>& p) {
    os << p.first << p.second;
    return os;
}

template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
    REP(i, (int)v.size())is >> v[i];
    return is;
}

template <typename T>
T clamp(T& n, T a, T b) {
    if (n < a)n = a;
    if (n > b)n = b;
    return n;
}

template <typename T>
static T GCD(T u, T v) {
    T r;
    while (v != 0) {
        r = u % v;
        u = v;
        v = r;
    }
    return u;
}

template <typename T>
static T LCM(T u, T v) {
    return u / GCD(u, v) * v;
}

template <class T>
std::vector<T> enum_div(T n) {
    std::vector<T> ret;
    for (T i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            ret.push_back(i);
            if (i * i != n) {
                ret.push_back(n / i);
            }
        }
    }
    return ret;
}

bool isPrime(ll num) {
    if (num < 2) return false;
    else if (num == 2) return true;
    else if (num % 2 == 0) return false;


    for (ll i = 3; i * i <= num; i += 2) {
        if (num % i == 0) {
            return false;
        }
    }

    return true;
};


template<typename T>
bool chmin(T& a, const T& b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<typename T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool is_integer(T x) {
    return std::floor(x) == x;
}

struct ToUpper {
    char operator()(char c) { return toupper(c); }
};

struct ToLower {
    char operator()(char c) { return tolower(c); }
};

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);

    string S;
    ll K;
    cin >> S >> K;

    ll ans = 0;
    int size = S.size();

    auto stringCounter = [](const std::string& S) {
        const int size = S.length();
        ll ans = 0;
        char now = S[0];
        ll cnt = 1;
        FOR(i, 1, size) {
            if (S[i] == now) {
                cnt++;
            }
            else {
                ans += cnt / 2;
                cnt = 1;
                now = S[i];
            }
        }
        ans += cnt / 2;
        return ans;
    };

    auto isOther = [](const std::string& S) {
        for (auto&& t : S) {
            if (S[0] != t)return true;
        }
        return false;
    };
    if (S[0] != S[size - 1] || K == 1) {
        ans = stringCounter(S) * K;
    }
    else {
        if (isOther(S)) {

            int right = size - 1;
            char now = S[right];
            while (right > 0 && now == S[right]) {
                right--;
            }

            int left = 0;
            now = S[left];
            while (left < size - 1 && now == S[left]) {
                left++;
            }
            ans = stringCounter(S) * K;
            int num = size - 1 - right + left;
            if (num % 2 == 0) {
                ans += (K - 1);
            }
        }
        else {
            string T = S + S;
            ans += stringCounter(T) * (K / 2);
            ans += stringCounter(S) * (K % 2);
        }
    }


    cout << ans << endl;
    return 0;
}

Measured memory_bytes: 256