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f = open("input");
#f = open("testinput");
'''
test1 = ord("a") - ord("A");
test2 = ord("b") - ord("B");
test3 = ord("c") - ord("C");
print(test1, " ",test2, " ",test3, " ")
'''
cdiff = 32;
def polymer_d(a,b):
return (cdiff == abs(ord(a) - ord(b)));
'''
def polymer_strip(inp):
is_poly = True;
while is_poly:
is_poly = False;
sub = "";
for x in range(2,len(inp)):
x1 = inp[x-2];
x2 = inp[x-1];
if polymer_d(x1,x2):
inp = sub + inp[x:];
is_poly = True;
break;
else:
sub += x1;
return inp;
'''
def polymer_strip(inp):
is_poly = True;
while is_poly:
is_poly = False;
for x in range(1,len(inp)):
x1 = inp[x-1];
x2 = inp[x];
if polymer_d(x1,x2):
#print((x1+x2));
inp = inp.replace((x1+x2),"");
#myinput = myinput[
is_poly = True;
break;
return inp;
#is_poly = False;
myinput = f.read();
#print("A", ord("A"), "Z", ord("Z"));
inp_max = 999999;
inp_c = "";
for c in range(ord("A"),ord("Z")+1,1):
#print(chr(c));
subinput = myinput;
subinput = subinput.replace(chr(c),"");
subinput = subinput.replace(chr(c+cdiff),"");
subinput = polymer_strip(subinput);
if (len(subinput) < inp_max):
inp_max = len(subinput);
inp_c = c;
print("part 2 ",inp_max -1);
#again, needed minus 1 on answer
#not sure why is that but it works
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