def appendAndDelete(s, t, k):
    if len(t) + len(s) <= k:
        return "Yes"
    
    while k > 0:     
        if s > t:
            s = s[:-1]
            k -= 1
        elif s == t:
            return "Yes"
        else:
            print(s)
            if s == t[:len(s)]:
                if (k - (len(t)-len(s))) % 2 == 0 and k >= len(t)-len(s):
                    return "Yes"
                return "No"
            else:
                s = s[:-1]
                k -= 1
            
    return "No"