Merkkijono

    
string=input()+"."

n=0
c=""

while c!=string:
    c=string
    for x in range(len(string)):
        if n==string[x]:

            a=0
            while(string[x]==string[a+x]):
                a+=1
            string=string[:x-1]+string[x+a:]
            break
        else:
            n=string[x]

print(string[:-1])

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR