int g_passed = 0;
int g_failed = 0;

int getc() {
    char c;
    int n = syscall(0, 0, &c, 1);
    if (n <= 0) return -1;
    return (int)c;
}

int write_char(int c) {
    char b;
    b = (char)c;
    syscall(1, 1, &b, 1);
    return 1;
}

int write_str(char *s) {
    int n = 0;
    while (s[n] != 0) n++;
    syscall(1, 1, s, n);
    return n;
}

int write_int(int n) {
    char tmp[24];
    int len = 0;
    int neg = n < 0;
    if (neg) { write_char('-'); n = -n; }
    if (n == 0) { write_char('0'); return 1; }
    while (n > 0) { tmp[len] = (char)('0' + n % 10); n = n / 10; len++; }
    int i = len - 1;
    while (i >= 0) { write_char(tmp[i]); i--; }
    return neg + len;
}

int check(char *name, int got, int want) {
    if (got == want) {
        write_str("PASS "); write_str(name); write_char('\n');
        g_passed++;
        return 1;
    }
    write_str("FAIL "); write_str(name);
    write_str(": got "); write_int(got);
    write_str(" want "); write_int(want);
    write_char('\n');
    g_failed++;
    return 0;
}

int read_line(char *buf, int cap) {
    int i = 0;
    int c;
    while (i < cap - 1) {
        c = getc();
        if (c == -1 || c == '\n') break;
        buf[i] = (char)c;
        i++;
    }
    buf[i] = 0;
    return i;
}

int test1() {
    int c = getc();
    int result = c;
    while (c != '\n' && c != -1) c = getc();
    return check("single_char_is_65", result, 65);
}

int test2() {
    char buf[64];
    int n = read_line(buf, 64);
    write_str(buf); write_char('\n');
    return check("readline_length", n, 5);
}

int test3() {
    int newlines = 0;
    int c;
    while (newlines < 2) {
        c = getc();
        if (c == -1) break;
        if (c == '\n') newlines++;
    }
    return check("count_lines", newlines, 2);
}

int test4() {
    int value = 0;
    int c;
    while (1) {
        c = getc();
        if (c < '0' || c > '9') break;
        value = value * 10 + (c - '0');
    }
    return check("parse_int", value, 42);
}

int test5() {
    char buf[64];
    int n = read_line(buf, 64);
    int i = 0;
    while (i < n) {
        char ch = buf[i];
        if (ch >= 'a' && ch <= 'z') buf[i] = ch - 'a' + 'A';
        i++;
    }
    write_str(buf); write_char('\n');
    return check("toupper_length", n, 5);
}

int test6() {
    int c = getc();
    return check("eof_is_minus1", c, -1);
}

int main() {
    test1();
    test2();
    test3();
    test4();
    test5();
    test6();

    write_char('\n');
    write_int(g_passed); write_str(" passed, ");
    write_int(g_failed); write_str(" failed\n");

    return g_failed == 0 ? 0 : 1;
}