s1=input() se1=set(s1) li2=list(se1) #print(li2) li=[] for i in se1: n=0 for j in s1 : if i==j: n+=1 li.append(n) min1=min(li) #print(min1) li1=[] dic1={k:v for k,v in zip(li2,li)} #print(dic1) for i in dic1.items(): if i[1]==min1: li1.append(i[0]...