count int N = 300;
char a[N + 1];
//
void input(char a[]) {
    char st[N + 2];
    scanf("%s", st);
    int sign = 1, pos = 0;
    if (st[0] == '+' || st[0] == '-') {
        sign = (st[0] == '+' ? 1 : -1);
        pos = 1;
    }
    int ia = 0, ist = strlen(st) - 1;
    for (; ist >= pos;)
        a[ia++] = st[ist--] - '0';
    for (; ia < N; ia++)
        a[ia] = 0;
    if (sign == -1)
        minus(a);
}
//
void minus(char a[]) {
    for (int i = 0; i < N; ++i)
        a[i] = 9 - a[i];
    for (int i = 0; i < N; ++i)
        if (a[i] == 9)
            a[i] = 0;
        else {
            a[i]++;
            return;
        }
}
//
void output(char a[]) {
    int sign = 1;
    if (a[N - 1] >= 5) {
        printf("-");
        minus(a);
        sign = -1;
    }
    int i = N - 1;
    while (i > 0 && a[i] == 0)
        --i;
    for (; i >= 0; --i)
        printf("%i", a[i]);
    if (sign == -1)
        minus(a);
}
//
void add(char dest[], char a[], char b[]) {
    int um = 0;
    for (int i = 0; i < N; ++i) {
        int t = a[i] + b[i] + um;
        dest[i] = t % 10;
        um = t / 10;
    }
}
//
void sub(char dest[], char a[], char b[]) {
    minus(b);
    add(dest, a, b);
    minus(b);
}
//
void mult(char dest[], char a[], char b[]) {
    for (int i = 0; i < N; ++i)
        dest[i] = 0;
    for(int i = 0; i < N; ++i)
        for (int j = 0; i + j < N; ++j) {
            int t = a[i] * b[j] + dest[i + j];
            dest[i+j] = t % 10;
            dest[i + j + 1] += t / 10;
        }
}