Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i -= 1
                flag = True
        if i+1 >= len(S)-2:
            break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]
            i -= 1
        if i+1 >= len(S)-1:
            break

    break
print(N-len(S))


Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i -= 1
                flag = True
        if i + 1 >= len(S)-2:
            break


    if flag:
        continue

    nS = len(S)
    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]
            i -= 1
        if i + 1 >= len(S)-2:
            break

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i += 2
                flag = True
                if i >= len(S)-3:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]
            i += 2
            if i >= len(S)-1:
                break

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i += 2
                flag = True
                if i >= len(N)-3:
                    break


    if flag:
        continue

    nN = len(S)
    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]
            i += 2
            if i >= len(nN)-2:
                break

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i += 2
                flag = True
                if i >= len(S)-3:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]
            if i >= len(S)-2:
                break

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = list(input())
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                del S[i:i+2]
                i += 2
                flag = True
                if i >= len(S)-3:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == ["0", "1"] or mid == ["1", "0"]:
            del S[i:i+2]

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == "01" or mid == "10":
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                S = S[:i] + S[i+2:]
                i += 2
                flag = True
                if i >= len(S)-3:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == "01" or mid == "10":
            S = S[:i] + S[i+2:]

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == "01" or mid == "10":
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                S = S[:i] + S[i+2:]
                i += 2
                flag = True
                if i >= len(S)-3:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == "01" or mid == "10":
            S = S[:i] + S[i+2:]

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Runtime Error):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == "01" or mid == "10":
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                S = S[:i] + S[i+2:]
                i += 2
                flag = True
                if i > len(S)-2:
                    break


    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == "01" or mid == "10":
            S = S[:i] + S[i+2:]

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))

Buggy python submission (verdict: Time Limit Exceeded):
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

import math
import numpy as np
import copy
from collections import defaultdict, Counter
from itertools import product
from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
while True:
    flag = False
    for i in range(1, len(S)-2):
        l = S[i-1]
        mid = S[i:i+2]
        r = S[i+2]
        if mid == "01" or mid == "10":
            if (l == "0" and r == "1") or (l == "1" and r == "0"):
                S = S[:i] + S[i+2:]
                flag = True
                break

    if flag:
        continue

    for i in range(0, len(S)-1):
        mid = S[i:i+2]
        if mid == "01" or mid == "10":
            S = S[:i] + S[i+2:]

    break
print(N-len(S))

Fixed submission:
# https://qiita.com/_-_-_-_-_/items/34f933adc7be875e61d0
# abcde	s=input()	s='abcde'
# abcde	s=list(input())	s=['a', 'b', 'c', 'd', 'e']
# 5(1つだけ)	a=int(input())	a=5
# 1 2	| x,y = map(int,input().split())   |	x=1,y=2
# 1 2 3 4 5 ... n 　	li = input().split()	li=['1','2','3',...,'n']
# 1 2 3 4 5 ... n 　	li = inpl()	li=[1,2,3,4,5,...,n]
# FFFTFTTFF 　	li = input().split('T')	li=['FFF', 'F', '', 'FF']

# INPUT
# 3
# hoge
# foo
# bar
# ANSWER
# n=int(input())
# string_list=[input() for i in range(n)]

# import math
# import numpy as np
# import copy
# from collections import defaultdict, Counter
# from itertools import product
# from bisect import bisect_left, bisect_right
def inpl(): return list(map(int, input().split()))

S = input()
N = len(S)
c0 = S.count("0")
c1 = S.count("1")

print(2*min(c0, c1))