popey456963

dna = input()
out = ""
for i in dna:
    if i == "A":out+="T"
    if i == "C":out+="G"
    if i == "G":out+="C"
    if i == "T":out+="A"
print(out)

popey456963

s=input()
a=s.count("A")
b=s.count("C")
c=s.count("G")
d=s.count("T")
print(str(a) + " " + str(b) + " " + str(c) + " " + str(d))

popey456963

print(''.join(c.lower() if c.isupper() else c.upper() for c in input()))

popey456963

import math
start = int(input())
end = int(input())
amount = int(input()) - 1

if amount == -1 and start == 0 and end == 0:
    print("NONE")
else:
    difference = end-start
    step = difference/amount

popey456963

line = input()
if len(line)%3 == 0:
    n=3
    c=""
    for i in [line[i:i+n] for i in range(0, len(line), n)]:
        c+=chr(int(i))
    print(c)
else:
    print("ERROR")

popey456963

p,a,c="n",[],""
for i in "2ab4g9cat":
 if i in "0123456789":
  if p=="n":c+=i
  else:a.append(c);c,p=""+i,"n"
 else:
  if p=="a":c+=i
  else:a.append(c);c,p=""+i,"a"
a.append(c)

popey456963

past=""
amount = 0
n = input()
past=n[0]
system = []
for i in n:
    if i == past:
        amount+=1
    else:
        system.append(str(amount) + past)

popey456963

input();print(sum([int(i)**2 for i in input().split()]))

popey456963

print(min(int(input()),int(input())))

popey456963

double=0
for i in input().split():
    past = ""
    for char in i:
        if char.lower() == past.lower():
            double+=1
            break
        else:
            past = char
print(double)