# Arup Guha
# 5/3/2020
# Solution to 2020 FHSPS Problem: Generating Usernames

# number of cases
nC = int(input(""))

# Process cases.
for loop in range(nC):

    # Split line.
    toks = input("").split()

    # Just print each piece as requested.
    print(toks[1], end="")
    print(toks[2][:2],end="")
    print("_", end="")

    # Now, grab school initials.
    for i in range(3, len(toks)):
        print(toks[i][0], end="")

    # Advance to next line.
    print()