MAX=999999
H=[0]*MAX
 
def insert(a):
    if H[a]==1:
        return 'element already present'
    H[a]=1
    return 'element inserted'
 
def delete(a):
    if H[a]==0:
        return 'element not present'
    H[a]=0
    return 'element deleted successfully'
 
def isPresent(a):
    if H[a]==1:
        return 'true'
    return 'false'
 
def get(a):
    if H[a]==0:
        return -1
    return a
 
 
print insert(10)
print isPresent(15)
print insert(10)
print insert(15)
print delete(10)
print get(15)

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