[рони]

различить любую пару слов

let val1 = "abc5 abc0 abcde abcfg";
let val2 = "a5 abc0 abcde abcfg";
const fn = str => {
    let words = str.split(/\s+/);
    let length = Math.max(...words.map(_=>_.length)), i = 0;
    k: for (; i < length; i++) {
        let temp = "";
    for(let a of words){
       if (a[i] !== void 0){
       if(temp.includes(a[i]))  continue k;
       temp += a[i];
       }

       }
       return ++i
    }
    return i
}
console.log(fn(val1))
console.log(fn(val2))