Перевести с pascal на python var s,s1: string; i: integer; begin readln(s); s1: =s; for i: =1 to length(s1) do begin if s1[i]='а' then s1[i]: ='б' else if s1[i]='а' then s1[i]: ='б' else if s1[i]='б' then s1[i]: ='а' else if s1[i]='б' then s1[i]: ='а'; end; writeln(s1); end.

S=input()
s1=""
for i in range(0,len(s)):
    if s[i]=="а":
        s1=s1+"б"
    elif s[i]=="А":
        s1=s1+"Б"
    elif s[i]=="б":
        s1=s1+"а"
    elif s[i]=="Б":
        s1=s1+"А"
    else:
        s1=s1+s[i]
print(s1)