AB19 rounded up to the hundreds place equals 7300. Round down AB19 to the tens place.
AB19 [OP_GEN_POSSIBLE_LIST] 7200 [OP_LIST_MORE] 7300 [OP_LIST_LESS_EQUAL] AB19 A [OP_LIST_FIND_UNK] 1000 [OP_MUL] AB19 B [OP_LIST_FIND_UNK] 100 [OP_MUL] [OP_ADD] 19 [OP_ADD] 2 [OP_FLOOR]
var_a = 'AB19'
ans_dict = dict()
var_a = str(var_a)
list_a = []
variable_candi = set(['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'])
for v in set(var_a):
    if v in variable_candi:
        ans_dict[v] = 0
candi = list(itertools.product('0123456789', repeat=len(ans_dict)))
for c in candi:
    temp = var_a
    for i, (k, _) in enumerate(ans_dict.items()):
        temp = temp.replace(k, str(c[i]))
    if len(var_a) == len(str(int(temp))):
        new_elem = int(temp)
        list_a.append(new_elem)
var_b = 7200
list_b = []
for i in list_a:
    if i > var_b:
        list_b.append(i)
var_c = 7300
list_c = []
for i in list_b:
    if i <= var_c:
        list_c.append(i)
var_d = 'AB19'
var_e = 'A'
var_d = str(var_d)
var_e = str(var_e)
unk_idx = var_d.index(var_e)
var_f = 0
for elem in list_c:
    elem = str(elem)
    var_f = int(elem[unk_idx])
var_g = 1000
var_h = var_f * var_g
var_i = 'AB19'
var_j = 'B'
var_i = str(var_i)
var_j = str(var_j)
unk_idx = var_i.index(var_j)
var_k = 0
for elem in list_c:
    elem = str(elem)
    var_k = int(elem[unk_idx])
var_l = 100
var_m = var_k * var_l
var_n = var_h + var_m
var_o = 19
var_p = var_n + var_o
var_q = 2
var_r=int((var_p//(10**(var_q-1)))*10**(var_q-1))

print(int(var_r))