Hi, this is for the Round 1C that have just passed. I have been stuck on it for 
4 hours. Hope that a kind soul will be able to guide me. I wrote it in python 3

URL: 
https://codingcompetitions.withgoogle.com/codejam/round/00000000000516b9/0000000000134c90

#all read functions credit to EricStansifer
#Q1

def readline():
    return input()
def readint():
    return int(input())
def readfloat():
    return float(input())
def readints():
    xs = input().split()
    return [int(x) for x in xs]
def readfloats():
    xs = input().split()
    return [float(x) for x in xs]
def printcase(casenum, x):
    print('Case #{:d}: {}'.format(casenum, x))
def run(main):
    t = readint()
    for casenum in range(1, t + 1):
        main(casenum)     

def main(casenum):
    a = readint() #number of other robots
    ls = []
    own_d = {'P':'R','R':'S','S':'P'}
    for i in range(a):
        ls.append(readline())
    ans = ''
    for col in range(500):
        if len(ls)== 0:
            printcase(casenum, '{}'.format(ans))
            return
        s = set()
        for things in ls:
            s.add(things[col%(len(things))])
        if len(s) ==3:
            printcase(casenum, '{}'.format('IMPOSSIBLE'))
            return
        elif len(s) == 2:
            if 'R' in s and 'P' in s:
                move = 'p'
            elif 'R' in s and 'S' in s:
                move = 'R'
            elif 'P' in s and 'S' in s:
                move = 'S'
        else:
            if 'R' in s:
                move = 'P'
            elif 'P' in s:
                move = 'S'
            else:
                move = 'R'
        ans += move
        owned = own_d[move]
        ls = [q for q in ls if not q[col%(len(q))]== owned]
        '''
        def todel(y):
            if "S" in y:
                return move == "R"
            if "R" in y:
                return move == "P"
            if "P" in y:
                return move == "S"
        ls = list(y for y in ls if not todel(y[col % len(y)]))
        '''
        
    printcase(casenum, '{}'.format(ans))
    return

run(main)

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