9498번 - 시험 성적
const fs=require('fs');
const input=fs.readFileSync('/dev/stdin').toString();
const score=parseInt(input);
if (score>=90){
console.log('A');
}
else if (score>=80){
console.log('B');
}
else if (score>=70){
console.log('C');
}
else if (score>=60){
console.log('D');
}
else{
console.log('F');
}
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