dnk = "ACCCAGTTTGA"
rnk = []
for char in dnk:
    #print("1 - " +
    if char == "A":
        char = "T"
        rnk.append(char)
    elif char == "T":
        char = "A"
        rnk.append(char)
    elif char == "C":
        char = "G"
        rnk.append(char)
    elif char == "G":
        char = "C"
        rnk.append(char)
#print(*rnk)
rnk.reverse()
print("".join(rnk))