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use fmt;
use bufio;
use os;
use strings;
use strconv;
export fn main() void = {
const sc = bufio::newscanner(os::stdin);
defer bufio::finish(&sc);
let safereports = 0;
for (const line => bufio::scan_line(&sc)!) {
const spl = strings::split(line, " ");
defer free(spl);
let safe = true;
let inc: (bool | void) = void;
for (let i = 1z; i < len(spl); i += 1) {
const s1 = strconv::stoi(spl[i-1])!;
const s2 = strconv::stoi(spl[i])!;
const diff = if (s1 < s2) {
match (inc) {
case void =>
inc = true;
case let inc: bool =>
if (!inc) {
safe = false;
break;
};
};
yield s2 - s1;
} else {
match (inc) {
case void =>
inc = false;
case let inc: bool =>
if (inc) {
safe = false;
break;
};
};
yield s1 - s2;
};
if (diff <= 0 || diff > 3) {
safe = false;
break;
};
};
if (safe) {
fmt::printfln("{}: Safe", line)!;
safereports += 1;
} else {
fmt::printfln("{}: Unsafe", line)!;
};
};
fmt::printfln("{} reports are safe", safereports)!;
};
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