Smallest chosen word - HackerEarth Solution

c = input()
x = input()
x = x.split(' ')
y = []
if len(x)==1:
    print(x[0], end = '')
    print(3, end = '')
elif len(x)==2:
    print(x[0], end = '')
    print(3, end = '')
else:
    print(x[0], end = '')
    for i in range(len(x[1])-1):
        if x[1][i]<=x[1][i+1] and x[1][i]!=x[2][i]:
            y.append(x[1][i])
        else:
            continue
    print(''.join(y), end = '')
    print(x[2])