Merkkijono

string=input()
n=0
try:
    while n+1<len(string):
        c0 = string[n]
        rem=1
        while string[n+rem]==c0:
            rem+=1
        if(string[n]==string[n+1]):
            string=string[:n]+string[n+rem:]
            n=-1
        n+=1
except:
    string=""
print(string)
    

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED