d = {}
def func(key, val):
    if key in d:
        d[key] += int(val)
    else:
        d[key] = int(val)
while True:       
    text = input()
    if not text:
        break
    key, val = text.split()
    func(key, val)
l = d.keys()
l = list(l) 
l.sort() 
for i in l: 
    print(i, d[i])

 while True: 
    try:      
        text = input()
    except : # или  except EOFE error:
        break

 while True: 
    try:      
        text = input()
    except :
        break

 Traceback (most recent call last):
  File "C:/Users/amini/Desktop/A.py", line 12, in <module>
    key, val = text.split()
ValueError: not enough values to unpack (expected 2, got 0)

 d = {}
def func(key, val):
    if key in d:
        d[key] += int(val)
    else:
        d[key] = int(val)
while True: 
    try:      
        text = input()
        key, val = text.split()
    except: 
        break
    func(key, val)
l = d.keys()
l = list(l) 
l.sort() 
for i in l: 
    print(i, d[i])