armyLunch.js

//s - sergeant; c - corporal; p - private

const n = +gets();
const soldiers = gets().split(' ');

const sortedSoldiers = (soldiers) => {
    const rankOrder = { S: 0, C: 1, P: 2 };

    soldiers.sort((a, b) => {
        const rankA = a.charAt(0);
        const rankB = b.charAt(0);

        if(rankOrder[rankA] < rankOrder[rankB]){
            return -1;
        }else if(rankOrder[rankA] > rankOrder[rankB]){
            return 1;
        }else{
            return 0;
        }
    });
    return soldiers;
};
console.log(sortedSoldiers(soldiers).join(' '))