function solution(msg) {
    var answer = [];
    
    const indices = {}
    for(let i=0; i<26; i++){
        indices[String.fromCharCode(65 +i)] = i+1
    }
    
    let indiceSize = 26;
    
    for(let i=0; i<msg.length; i++){
        let acc = msg[i]
    
        while(indices[acc + msg[i+1]]){
            acc = acc + msg[i+1]
            i++;
        }
    
        indiceSize++;
        indices[acc+ msg[i+1]] = indiceSize
    
        const indice = indices[acc]
        
        answer.push(indice)
    }

    return answer;
}