print("Wprowadz tekst: ")
str = input()
print(str)
'''if str.find(' ') > 0 and  str[len(str) - 1] != ' ':
    print("Wprowadzono wiecej niz jeden wyraz")'''
new_str = str.strip()
double_spaces = True
while double_spaces:
    for i in range(0,len(new_str) - 1):
        if new_str[i] == ' ' and new_str[i+1] == ' ':
            new_str[i].translate({ord(' '): None})
        else:
            double_spaces = False

print(new_str)