import sys def paixu(key,array): result=[] aaa=[] changdu=0 n=len(array) for i in range(n): changdu+=len(array[i]) while len(aaa)<changdu: for j in range(n): if len(array[j])<key: result.append(array[j][0:]) del array[j][0:] else: result.append(array[j][0:key]) del array[j][0:key] aaa=[] for i in result: aaa.extend(i) RRR=[] for i in result: RRR.extend(i) return RRR if __name__ == "__main__": key = int(input()) array = [] while 1: try: array.append(list(map(int, input().split(',')))) except: break #print(paixu(key, array)) A=paixu(key,array) A = ','.join(('%s' %i for i in A)) print(A)