a=0
while a!=1:
    print("1. add information")
    print("2. display all information")
    print("3. search a particular info")
    print("4. delete a particular info")
    print("5. modification a particular info")
    print("6. exit")
    ch=int(input("enter your choice"))
    d={}
    if(ch==1):
        n=int(input("how many elements u want to enter"))
        for i in range(n):
            r=input("enter rollno")
            n=input("enter name")
            m=int(input("enter marks"))
            d[r]=n,m
        print(d)
    elif(ch==2):
        for i in d:
            print(i,d[i])
    elif(ch==3):
        s=input("enter the key which u want to search")
        for i in d:
            if(i==s):
                print(d[i])
    elif(ch==4):
        s=input("enter the key which u want to search")
        for i in d:
            if(i==s):
                d.pop(s)
        print(d)
    elif(ch==5):
        s=input("enter the key which u want to search")
        v=int(input("enter the value"))
        d[s]=v       
        print(d)
    elif(ch==6):
        a=1