Not sure what the format was for KRYS-AM but the current KRYS-FM in Corpus Christi, Texas is Country so there's a good chance the AM was as well. It was a Radio Disney outlet long after this sticker was printed which has a 1970s look to it. 1360 AM is now KKTX, a News/Talk station.
EDIT: 15 years after originally posting this I received a KRYS music survey in the form of a 45 rpm record sleeve. The chart confirms what many have already said in the comments, that KRYS was a Pop/Top-40 station...at least in 1978.