L=['A', 'B', 'M', 'D', 'E', 'F', 'L', 'H', 'I', 'J', 'R', 'G', 'N', 'C', 'O', 'Q', 'P', 'K', 'S', 'Y', 'U', 'V', 'W', 'X', 'T', 'Z', '/', '+', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
N=[ 0,   1,    2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,  15,  16,  17,  18,  19,  20,  21,  22,  23,  24,  25, 100, 100, 100,  0,   1,   2,   3,   4,   5,   6,   7,   8,   9]

table=dict()
for i in range(len(L)):
    table[L[i]] = N[i]

text = open("EVEN.txt", "r").read()

pairs = list()
string_pair = ""
for c in text:
    if table[c]%2==0:
        string_pair = string_pair+c
    else:
        pairs.append(string_pair)
        string_pair=""

solution = max(pairs, key=len)
print(solution)