hello
HELLO
world
WORLD
exit

process.stdin.setEncoding('utf8');

process.stdin.on('data', (data) => {
const lines = data.trim().split('\n');
for (const line of lines) {
if (line.toLowerCase() === 'exit') {
process.exit(0);
} else {
console.log(line.toUpperCase());
}
}
});