#include <iostream>
#include <cstring>
using namespace std;

template <class T>
T uread() {
    char c = getchar();
    while (c < '0' || c > '9') {
        c = getchar();
    }
    T num = 0;
    while (c >= '0' && c <= '9') {
        num = (num << 1) + (num << 3) + (c ^ 48);
        c = getchar();
    }
    return num;
}

void Alice() {
    char str[17];
    scanf("%s", str + 1);
    int len = (int)strlen(str + 1);
    for (int i = 2; i <= len; ++i) {
        if (str[i] == str[i - 1]) {
            str[i] = 'z' + 1;
        }
    }
    int n = uread<int>(), a[10001];
    for (int i = 1; i <= n; ++i) {
        a[i] = uread<int>();
    }
    int m = 0, idx = 1, now = 0, b[10001];
    for (int i = 1; i <= n; ++i) {
        if (a[i] % 27 == str[idx] - 'a') {
            b[++m] = a[i];
            ++now;
        }
        if (now == 20) {
            now = 0;
            if (++idx > len) {
                break;
            }
        }
    }
    printf("%d\n", m);
    for (int i = 1; i <= m; ++i) {
        printf("%d ", b[i]);
    }
    putchar('\n');
}

void Bob() {
    int n = uread<int>(), a[10002];
    for (int i = 1; i <= n; ++i) {
        a[i] = uread<int>() % 27;
    }
    char ans[16];
    int len = 0;
    for (int i = 1; i <= n; ++i) {
        if (a[i] != a[i + 1]) {
            ans[++len] = a[i] + 'a';
        }
    }
    for (int i = 2; i <= len; ++i) {
        if (ans[i] > 'z') {
            ans[i] = ans[i - 1];
        }
    }
    for (int i = 1; i <= len; ++i) {
        putchar(ans[i]);
    }
    putchar('\n');
}

int main(int argc, const char * argv[]) {
    char opt[1 << 3];
    scanf("%s", opt);
    if (*opt == 'E') {
        Bob();
    } else {
        Alice();
    }
    return 0;
}